[621]*621LAY, Chief Judge.
Reed Hamilton, an Iowa prisoner, was convicted of first degree murder and voluntary manslaughter in connection with the shooting deaths of Nick Pappas, Jr., and Cathy Larson. The Iowa Supreme Court affirmed his convictions on Hamilton’s direct appeal. State v. Hamilton, 335 N.W.2d 154 (Iowa 1983). Hamilton petitioned for a writ of habeas corpus in federal district court1 alleging that his convictions were obtained in violation of his fifth and sixth amendment rights by the admission of certain evidence. He further complained that he was denied due process of law by certain statements made by the prosecution at trial and by his conviction for first degree murder based on felony murder. The district court denied Hamilton’s petition. This appeal followed.
Nick Pappas, Jr., and Cathy Larson were found dead of gunshot wounds in their Des Moines home on the evening of January 25, 1978. There was substantial evidence that Pappas regularly sold large quantities of drugs. Pappas had been shot twice in the back of the head with a .38 caliber revolver; Larson, three times with the same weapon. Their bodies were discovered by Nick Pap-pas’ father and sister sometime between 5:30 and 6:00 p.m.
Shortly after 6:00 p.m., Reed Hamilton appeared at the home of a childhood friend, soaking wet and shaking violently. Hamilton told his friend that he had gone out on the river after an argument with his girlfriend, Diane Nystrom, and had fallen through the ice. The friend gave Hamilton some dry clothes, and, while Hamilton changed, counted out $279.00 Hamilton had with him at Hamilton’s request. Hamilton soon left his friend’s house, and arrived at his mother Maxine Hamilton’s home sometime after 6:30 p.m.
Hamilton entered his mother’s house carrying a suitcase. Both Maxine Hamilton and Paul Lincoln, a man with whom Maxine was living at the time, were present when Hamilton arrived- Hamilton took the suitcase down into the basement of the house and came back upstairs empty handed. After Hamilton left to pick Diane Nystrom up from work, Lincoln looked into the suitcase and found two plastic bags inside. Lincoln stated at trial that the bags contained “some kind of tobacco” with a strange smell.
The next day, a postal carrier reported to the police that windows were being broken out of Nystrom and Hamilton’s West Des Moines home. A patrolman went to investigate the incident, and found Hamilton sitting in a car in front of the house, dressed only in a bathrobe. Hamilton told the officer that he lived there and that some people had been trying to kill him. Hamilton said that he thought one of them was Nick Pappas’ brother. After additional police officers arrived, a search of the house was conducted. No intruders were found, but a bag of marijuana and an empty handgun holster were discovered. Hamilton was then arrested for possession and taken to the West Des Moines police station.
Hamilton was later transferred to the Des Moines police station where, after being advised of his Miranda rights, he was questioned about his activities during the previous day. The Iowa Supreme Court determined that Hamilton initially made the following statements to the police:
[Hamilton] said he had gone to the victims’ house between 3:00 and 3:30 p.m. on the day of the shooting and that Nick Pappas and Cathy Larson were there at the time. He said he purchased some marijuana from Pappas and left for home, where he and his fiancee, Diane Nystrum [sic], stayed until about 8:00 p.m. when they went shopping and to his mother’s house before returning home. He stated that just prior to going to bed, Diane had seen a shadow outside the house and that he had gone upstairs to get his shotgun. He said he had sat up [622]*622all night to protect the home with his shotgun. The officers then asked him if he had any guns besides the shotgun. Hamilton replied that he had a .38 caliber revolver and, when asked where it was, responded that it was “over to his mother’s house.”
Hamilton, 335 N.W.2d at 159. After Hamilton made these statements, all but one of the officers present left the interrogation room to prepare an application for a warrant to search Maxine Hamilton’s home.
Hamilton then asked the officer who remained in the room to lock the door and confided that he “needed help.” In response, the officer replied, “Tell us the truth and we will try to help you.” The state judge who held the suppression hearing found this promise of leniency rendered the remainder of Hamilton’s statement involuntary and inadmissible.2 As recounted by the Iowa Supreme Court, following the officer’s promise of leniency:
[Hamilton] stated he had shot the victims and that he had taken approximately ten pounds of marijuana and one ounce of cocaine from the Pappas home; that he took the marijuana to his mother’s home where he placed it in a suitcase and hid it in the basement, then he went to “a river” to dispose of the gun and, while walking on the ice, fell in.
Hamilton, 335 N.W.2d at 156. Hamilton then agreed to show the police where he had hidden the gun. It was decided, however, to wait until the next morning to act on this plan, because it was too dark to see.
Early the following morning, January 27, at approximately 5:00 a.m., Hamilton called his mother from jail. He asked that she remove the suitcase in the basement from her house. His mother told him that she knew he hadn’t killed anyone, to which he replied, “oh yeah, but I did.” Paul Lincoln was in the same room with Maxine when she received the call, and heard some of her side of the conversation. According to Lincoln, he and Maxine then went into the living room to talk. It is undisputed that Maxine later took the suitcase to the home of a family friend, Ann Morrison, and asked Morrison to keep it. Less clear is whether Paul Lincoln went with her.3 The Iowa Supreme Court found, however, that “Lincoln’s testimony also confirmed * * * that he and Maxine * * * took the suitcase to the home of Ann Morrison.” Hamilton, 335 N.W.2d at 157.
The police arrived at Maxine Hamilton’s home at 10:00 a.m. to execute the search warrant, prepared the night before, for locating marijuana and a .38 caliber gun. The search revealed neither the gun nor the marijuana. Maxine Hamilton initially denied that Reed had brought any marijuana into the house. Then one of the officers told her that the police knew Reed had carried ten pounds of marijuana into her house in a suitcase. Shortly thereafter, Maxine admitted, in response to direct questions, that Reed had brought a suitcase into the house and that she had removed it. She did not, however, divulge the location of the suitcase. The testimony is again conflicting, however, regarding [623]*623what she may have said to the police about Hamilton’s early morning telephone call. Maxine Hamilton testified that she lied to the police that morning, and specifically denied telling them anything about the phone call. There was some testimony, however, that she did relate the substance of the call to one officer.4 In any case, all law enforcement personnel present testified that she was generally uncooperative.
In the meantime, Reed Hamilton had requested the assistance of an attorney who demanded that the police cease questioning Hamilton. Hamilton’s attorney also sought and was granted a court order restraining the police from interrogating Hamilton further. The police subverted this order, however, by persuading Diane Nystrom to act as a conduit for their questions and to convince Reed to retrace the route he took following the killings. The officers told Nystrom that if she could induce Hamilton to cooperate, charges against him would be reduced and he would receive immediate psychiatric help. The officers also said they were afraid children would find the murder weapon if Hamilton did not recover it for them. Nystrom then agreed to do as the police asked. She spoke with Hamilton briefly, and then Nys-trom and Hamilton got into a squad car with two police officers. They then trav-elled the path Hamilton followed the day of the killings, with the officers transmitting questions to Hamilton through Nystrom, and Hamilton in turn answering through her.5 The officers, Nystrom and Hamilton eventually arrived at Maxine Hamilton’s home. Reed Hamilton went to his mother and whispered to her that she should tell the police what sheTinpw, and should retrieve the suitcase because the police were
going to help him. Maxine Hamilton and Lincoln later recovered the suitcase and delivered it to the police. They both also gave complete statements, including an account by Maxine Hamilton of her telephone conversation with her son.
There were two trials in this case.6 Hamilton’s invalidly obtained confession and any direct reference to the trip retracing Hamilton’s path were excluded at both trials. Neither Maxine Hamilton nor Paul Lincoln testified at the first trial, although both had been subpoenaed for the limited purpose of identifying and discussing the .38 gun. Both were adjudged in contempt of court. Maxine Hamilton was sentenced to three months in jail, Paul Lincoln to six months. Ann Morrison also did not testify, and the ten pounds of marijuana were not admitted into evidence.
At the second trial, Lincoln and Maxine Hamilton were both served a subpoena and did testify. Ann Morrison also testified, and the suitcase of marijuana was admitted into evidence. Maxine Hamilton testified that Reed Hamilton had borrowed a hand gun from her sometime before the shootings, and that he had brought the marijuana into her house that evening. She also testified about the early morning telephone call she received from Reed in which he admitted shooting Pappas and had asked her to remove the marijuana from her basement. Paul Lincoln testified that Hamilton had brought the marijuana into the house, confirmed that Maxine had received the call from Reed, and stated that he and Maxine took the suitcase containing the marijuana to Ann Morrison’s house. Morrison testified, too, that Maxine had brought the suitcase to her early that morning and that [624]*624Maxine and Lincoln had retrieved it later in the day.
Defense counsel objected to the admission of Maxine’s testimony of Reed’s confession to her, all testimony relating to the storage, transfer, and retrieval of the marijuana and the marijuana itself, on the ground that it was inadmissible fruit of Hamilton’s illegally obtained confession and the illegal trip. The state trial court overruled these objections, reasoning that the confession to Maxine and the evidence relating to the marijuana “had nothing to do with” the illegal police conduct. The trial court also denied Hamilton’s motion for directed verdict of acquittal for felony murder in the death of Cathy Larson and overruled his objection to a felony murder instruction. Hamilton’s motions for mistrial based on certain statements made by the prosecutor, including references to Hamilton’s confession to his mother in opening and closing argument, were likewise denied. The jury convicted Hamilton of first degree felony murder for the death of Cathy Larson and voluntary manslaughter for the death of Nick Pappas.
The Iowa Supreme Court affirmed Hamilton’s convictions on appeal. 335 N.W.2d 154 (Iowa 1983). The state court rejected Hamilton’s contention that Maxine’s testimony regarding his confession to her and the transfer of the marijuana was inadmissible, relying on the “independent source” exception to the exclusionary rule. The court reasoned that since the police were aware of Maxine Hamilton’s identity and potential as a witness before any police illegality occurred, the admissibility of her testimony was unaffected by the subsequent acts of misconduct. Hamilton, 335 N.W.2d at 158-59. The testimony of Lincoln and Morrison was deemed admissible for the same reason, as their identities and value as witnesses came to light when the police pursued the investigation through Maxine Hamilton. Id. at 160. The state court also rejected Hamilton’s claim that certain comments made by the prosecutor warranted a mistrial. Id. at 160. Finally, the submission of the felony murder charge was held sufficiently supported by the evidence that Hamilton had killed Cathy Larson while perpetrating a robbery. Id. at 161.
The federal district court on habeas agreed and dismissed Hamilton’s petition. The district court generally concurred in the state court’s analysis of the admissibility of the challenged evidence. The district court also rejected Hamilton’s argument that the state secured Maxine’s cooperation in the investigation only by the illegal conduct, that she testified involuntarily, and that therefore her testimony should have been suppressed. Such an approach, the district court reasoned, would involve the court in the overly speculative task of probing a witness’s subjective motivations, and would be contrary to the principle that the state has the right to every person’s evidence. The district court also found no constitutional error in the challenged statements by the prosecutor and in the sufficiency of the evidence to support the conviction for felony murder.
On appeal to this court, Hamilton again challenges the admissibility of Maxine Hamilton’s testimony of his confession to her, and the testimony given by Maxine, Lincoln, and Morrison regarding the ten pounds of marijuana. Absent their foundational testimony linking Hamilton to the marijuana itself, Hamilton also argues that the marijuana was inadmissible. For the following reasons, we agree that all of this evidence was inadmissible “fruit” of the police misconduct.
It is axiomatic that the exclusionary rule bars the admission of physical evidence and live witness testimony obtained through the exploitation of police illegality, see e.g., Wong Sun v. United States, 371 U.S. 471, 484-86, 83 S.Ct. 407, 415-17, 97 L.Ed.2d 441 (1963), or, to invoke the metaphor, evidence that is “fruit of the poisonous tree.”7 Three exceptions to the [625]*625exclusionary rule have been recognized, however, permitting the use of such evidence if the prosecution shows that it was or could have been secured “by means sufficiently distinguishable to be purged of the primary taint.” Id. at 487-88, 83 S.Ct. at 417. Evidence may be admitted if it has but an “attenuated link” to the underlying illegality, United States v. Ceccolini, 435 U.S. 268, 273-79, 98 S.Ct. 1054, 1058-62, 55 L.Ed.2d 268 (1978); United States v. White, 746 F.2d 426, 428 (8th Cir.1984), if it derived from a source independent of the illegal conduct, Silverthorne Lumber Co. v. United States, 251 U.S. 385, 392, 40 S.Ct. 182, 183, 64 L.Ed. 319 (1920), or if the evidence would inevitably have been discovered absent the illegality. Nix v. Williams, 467 U.S. 431, 104 S.Ct. 2501, 2507-11, 81 L.Ed.2d 377, (1984); United States v. Apker, 705 F.2d 293, 306-07 (8th Cir.1983).
The state contends that the challenged evidence was all sufficiently attenuated from Hamilton’s illegally obtained statements to permit its admission.8 In Ceccolini, the Supreme Court set forth the analytical framework for evaluating whether live witness testimony falls within the exception. The Court deemed of paramount importance the extent to which “the basic purpose of the exclusionary rule will be advanced by its application” in a particular case. Ceccolini, 435 U.S. at 276, 98 S.Ct. at 1060. Relevant to that determination are the costs of permanently disabling a witness from testifying and the degree of free will exercised by the witness in testifying. Id. at 276-78, 98 S.Ct. at 1060-61. Where the cooperation of a witness is in fact the result of an exercise of the individual’s free will, unaffected by police misconduct, the purpose of the exclusionary rule would not be served by disallowing the testimony. In determining the strength of the link between the illegality and a witness’ testimony, Ceccolini directs us to consider the stated willingness of the witness to testify, the role played by the illegally seized evidence in gaining the witness’ cooperation, the proximity between the illegal behavior, the decision to cooper[626]*626ate and the actual testimony at trial, and the police motivation in engaging in the illegal conduct. Id. at 279-80, 98 S.Ct. at 1061-62; see also United States v. Leonardo 623 F.2d 746, 752 (2d Cir.1980).
Applying these factors to the case before us, we conclude that they require the exclusion of Maxine Hamilton’s testimony. Throughout the trial court proceedings, she repeatedly expressed her unwillingness to testify. She spent time in jail for contempt during the first trial to avoid giving testimony against her son. There can be no stronger statement of her unwillingness to cooperate than her refusal to do so. She appeared at the second trial again only under subpoena, and after spending three months in jail was well aware of the consequences of future defiance of the order. Testifying under threat of contempt cannot be deemed an expression of willing cooperation. See United States v. Scios, 590 F.2d 956, 961 (D.C.Cir.1978) (decision to testify a product of coercion when made under threat of contempt); United States v. Houltin, 566 F.2d 1027, 1037 (5th Cir.1978) (Wisdom, J., dissenting) (testimony under threat of contempt obviously coercive); cf. United States v. Stevens, 612 F.2d 1226, 1230 (10th Cir.1979) (testimony voluntary when witness testified he cooperated out of a desire to change his lifestyle).
Further, the police misconduct played a crucial role in obtaining Maxine’s initial cooperation. Hamilton’s compliance with the officers, plainly the result of their misconduct, was used as “leverage” to gain her assistance. See United States v. Rubalcava-Montoya, 597 F.2d 140, 143 (9th Cir.1978) (witnesses directly confronted with evidence yielded by illegal search); cf. United States v. Miller, 666 F.2d 991, 996 (5th Cir.1982) (no evidence that police used illegally seized evidence in questioning witnesses); United States v. Brookins, 614 F.2d 1037, 1043 (5th Cir.1980) (same). Maxine became fully cooperative with the police only when Reed appeared at her doorstep, accompanied by the officers, and requested that she assist in the investigation because the police had offered to help him. The officer’s initial promise of leniency, together with the same promises made to Diane Nystrom, plainly motivated Hamilton’s plea to his mother that she cooperate fully with the police. The illegal trip in turn created the opportunity for Hamilton to make the request face-to-face to his mother and without the advice of counsel. These circumstances suggest a “close, direct link between the illegal [conduct] and the testimony” ultimately given by Maxine Hamilton. Rubalcava-Montoya, 597 F.2d at 143.
It is true that Maxine Hamilton may have divulged some information incriminating Reed when the police were in her home executing the search warrant, before she was aware that Reed had been coerced into cooperating with the police. That she may have done so does not alter our analysis, however. She did tell them that Reed had brought a suitcase into the house and that she had taken it “somewhere.” The police report indicates that she gave them this information, however, only after the police told her that they already knew Reed had hidden the suitcase there, information they had obtained during Hamilton’s illegal confession. Again, these circumstances suggest a direct exploitation of Reed’s confession in securing Maxine’s statement. One of the officers also stated that Maxine told him the substance of Reed’s 5 a.m. confession to her at that time. Maxine vigorously denied telling the officers this, however. In any event, given the strong showing in this case of the coercion necessary to compel Maxine to testify, we would consider such an admission of minimal significance to the ultimate question of the voluntariness of her testimony.
Our analysis of the proximity of the link between the illegally obtained confession and Maxine Hamilton’s willingness to cooperate is also unaffected by the fact that the police were aware of her identity and potential as a witness before any misconduct occurred. The Iowa Supreme Court and the district court below relied on the officers’ prior knowledge of her identity and involvement in Reed’s activities in [627]*627holding her testimony admissible.9 Certainly the extent of such independent knowledge may be a factor in evaluating the causal connection between her testimony and the illegal conduct. See e.g., Leonardi, 623 F.2d at 752; United States v. Schaefer, 691 F.2d 639, 645 (3d Cir.1982); United States v. Cella, 568 F.2d 1266, 1286-87 (9th Cir.1977). That her identity had been discovered, however, does not mean that the substance of her testimony, and her willingness to give it, had likewise been secured. As the Court in Ceccolini stated, “[t]he fact that the name of a potential witness is disclosed to police is of no evidentiary significance, per se, since the living witness is an individual human personality whose attributes of will, perception, memory and volition interact to determine what testimony he will give.” Ceccolini, 435 U.S. at 277, 98 S.Ct. at 1060 (quoting Smith v. United States, 324 F.2d 879, 881-82 (D.C.Cir.1963) (Burger, J.)). Again, given the strength of the evidence of the involuntariness of Maxine Hamilton’s testimony, we do not view her prior identification as a potential witness of particular weight.10
Ceccolini also requires us to consider the length of time between the illegal conduct, the decision to cooperate, and the actual testimony at trial in evaluating the volun-tariness of a witness’s testimony. This consideration goes to the probability that a long span of time between these events afforded the witness a chance for extended reflection indicating that the testimony ultimately given was the product of free choice. See Ceccolini, 435 U.S. at 279, 98 S.Ct. at 1061; United States v. Mergist, 738 F.2d 645, 648 (5th Cir.1984); United States v. Hooton, 662 F.2d 628, 633 (9th Cir.1981). In this case, there was over a three year lapse between the time Maxine Hamilton was wrongfully induced to cooperate and the time of her subpoenaed testimony. One might reason that this long delay supports an inference that considerations unrelated to the police misconduct intervened to dispel her original determination to protect her son. However, there exists nothing in the record to demonstrate any such change in her attitude.
Finally, the last Ceccolini factor, the police motivation in engaging in the improper conduct, also weighs in favor of exclusion. The promises made to induce Hamilton’s confession, and the officers’ blatant disregard of Hamilton’s counsel’s request not to question him further appear to have been directed in large part at discovering such valuable testimony. In such circumstances, Ceccolini suggests that even willing testimony may be inadmissible. See Ceccolini, 435 U.S. at 276 n. 4, 98 S.Ct. at 1060 n. 4 (voluntariness may be differently weighed when illegal conduct is engaged in for the specific purpose of discovering potential witnesses). Moreover, the Supreme Court has recently noted that an assessment of the flagrancy of police misconduct is an important step in evaluating the deterrent effect of exclusion. United States v. Leon, - U.S. -, 104 S.Ct. 3405, 3415, 82 L.Ed.2d 677 (1984). It could not have escaped the officers that Hamilton would convey the same enthusiasm for cooperation to his mother when they met during the illegal excursion that he himself showed as a result of their promises of leniency. We hold, therefore, for all of the above reasons, that the ultimate purposes of the exclusionary rule would be served by [628]*628exclusion of Maxine Hamilton’s unwilling testimony.11
We next turn to the issue of the admissibility of Paul Lincoln’s testimony. His testimony established that Reed had brought a large quantity of marijuana into the house, that Maxine had received a phone call from Reed in the middle of the night, and that he and Maxine had delivered the marijuana to Ann Morrison. The Iowa Supreme Court concluded that Paul Lincoln’s testimony was admissible, since his identity and potential value as a witness were discovered through Maxine Hamilton, not the police misconduct. We do not dispute that the police legally discovered his identity, but we again find difficulty in the admission of his testimony under Ceccoli-ni.
On the surface, the circumstances surrounding Paul Lincoln’s testimony suggest more persuasive reasons for admitting his testimony than Maxine Hamilton’s testimony. There is, in Lincoln’s case, “evidence that [he] was completely uncooperative when originally discovered * * * but later changed his attitude and supplied the necessary information.” United States v. Parker, 722 F.2d 179, 185 (5th Cir.1983) (quoting United States v. Marder, 474 F.2d 1192, 1196 (5th Cir.1973)). He did state at trial that he was testifying willingly, and that he would have testified at the first trial except that his lawyer “asked him not to.”
A witness’s stated willingness to testify, however, is just one of the factors to be considered under Ceccolini. In all other respects, Paul Lincoln’s testimony was derived and was given under circumstances identical to the circumstances surrounding Maxine Hamilton’s testimony. Like Maxine Hamilton, he testified only under subpoena at the second trial after having spent time in jail for contempt for refusing to testify at the first trial. Lincoln did state at the second trial that he would have told the police officers anything they wanted to know during the initial investigation. However, the record discloses that the police did question Lincoln when they executed the search warrant and that he was even less cooperative than was Maxine Hamilton at that time. Lincoln accompanied Maxine to retrieve the marijuana and gave his statement to the police only after Hamilton, at Nystrom’s request, sought his mother’s cooperation. Thus, the nexus between the illegal conduct and Lincoln’s cooperation is at least as compelling in his case as it is in Maxine Hamilton’s.
Further, the conduct of the police in seeking evidence about the marijuana was particularly flagrant. During the execution of the search warrant, one of the officers specifically said they knew about the marijuana in order to induce Maxine Hamilton and Lincoln to speak. This information came directly from Reed Hamilton’s confession and was no doubt the kind of evidence the police were motivated to uncover in making the promises to Hamilton in the first place. Under these circumstances, where the police misconduct arose from a desire to find just the sort of evidence ultimately adduced through Lincoln’s testimony, the significance of the witness’s stated willingness to testify is further diminished. See Ceccolini, 435 U.S. at 276 n. 4, 98 S.Ct. at 1060 n. 4. We therefore conclude that Paul Lincoln's testimony was also inadmissible fruit of the unconstitutional police conduct.12
Finally, the state presents no evidence suggesting that, absent the testimony of Maxine Hamilton or Paul Lincoln, Ann Morrison would have been identified or come forward as a witness. Nor is there any evidence that the police would have or [629]*629could have located the marijuana and uncovered sufficient foundational evidence linking it to Hamilton and the scene of the crime to permit its admission at trial. In sum, we hold that all of the challenged testimony and physical evidence should have been excluded and was improperly admitted.
We must yet determine whether, given that this unconstitutionally obtained evidence was improperly admitted, its use at trial was harmless beyond a reasonable doubt. See Chapman v. California, 386 U.S. 18, 23, 87 S.Ct. 824, 827, 17 L.Ed.2d 705 (1967); Anderson v. Nelson, 390 U.S. 523, 88 S.Ct. 1133, 20 L.Ed.2d 81 (1968); Stump v. Bennett, 398 F.2d 111, 121 (8th Cir.1968). The state produced considerable evidence tending to show that Hamilton was at the Pappas residence near the time of the shootings and that Pappas was Hamilton’s drug supplier. It was also undisputed at trial that Hamilton had used substantial amounts of cocaine the day of and day after Pappas and Larson were killed, and that he had a gun similar to the one used to kill them. However, the state placed considerable reliance on Hamilton’s early morning confession to his mother in establishing that Lincoln had killed Pappas and Larson. The prosecutor, in fact, near the end of his closing argument reminded the jury that the “one person you don’t lie to is your mother.” Further, the suitcase of marijuana was crucial to the state’s theory of motive. The prosecutor plainly sought to convince the jury that Hamilton had killed Pappas to get the drugs. Finally, the marijuana played a pivotal role in the state’s proof that a robbery had occurred, the underlying felony supporting the felony murder conviction for the death of Cathy Larson. Given the key role the challenged testimony and physical evidence played in the prosecution’s case, we hold that the constitutional error in admitting this evidence was not harmless beyond a reasonable doubt.13
The judgment of conviction is vacated; the cause is remanded to the district court to grant the writ of habeas corpus unless the state provides a new trial for the petitioner within a reasonable period of time as determined by the federal district court after consultation with counsel for the respective parties.