VAN GRAAFEILAND, Circuit Judge:
This is an appeal from an order of the United States District Court for the Western District of New York denying a Rule 24 application to intervene. We affirm.
In February 1977, Patricia Brennan and J. Paul Brennan, a young couple in Rochester, New York, undertook the somewhat awesome task of disputing with the United States Postal Service the constitutionality of the Private Express Statutes and applicable Postal Service Regulations. 18 U.S.C. §§ 1693-99, 1724; 39 U.S.C. §§ 601-06; 39 C.F.R. §§ 310, 320. The dispute arose out of the Service’s action seeking permanently to enjoin the Brennans from running a small mail delivery business in the downtown Rochester area.
The only issue raised by the pleadings was one of law. The Brennans admitted the material facts alleged in the complaint and predicated their defense solely on the asserted unconstitutionality of the statutes. The case was therefore an appropriate one for summary'. judgment, and plaintiff moved for that disposition. At the time plaintiff’s motion was made, the- district court was considering an application to intervene filed by the National Association of Letter Carriers (NALC), a national labor union which acts as the bargaining agent tor some 200,000 employees of the Postal Service. Following plaintiff’s motion, the district court denied the application to intervene and thereafter granted summary judgment in favor of the Postal Service.1
Although we affirm the order denying intervention, we do not agree with the district court that NALC had no standing to assert its proposed claim. “[T]he question of standing in the federal courts is to be considered in the framework of Article III which restricts judicial power to ‘cases’ and ‘controversies.’ ” Association of Data Processing Service Organizations, Inc. v. Camp, 397 U.S. 150, 151, 90 S.Ct. 827, 828, 25 L.Ed.2d 184 (1970); see also Sierra Club v. Morton, 405 U.S. 727, 732, 92 S.Ct. 1361, 31 L.Ed.2d 636 (1972). The existence of a case or controversy having been established as between the Postal Service and the Brennans, there was no need to impose the standing requirement upon the proposed intervenor. See Trbovich v. United Mine Workers, 404 U.S. 528, 536-39, 92 S.Ct. 630, 30 L.Ed.2d 686 (1972); Hodgson v. United Mine Workers, 153 U.S.App.D.C. 407, 473 F.2d 118 (1972); see also Shapiro, Some Thoughts on Intervention Before Courts, Agencies, and Arbitrators, 81 Harv.L.Rev. 721, 726-29 (1968) (cited with approval in Trbovich, 404 U.S. at 536 n.7, 92 S.Ct. 630 and in United States v. Board of School Commissioners, 466 F.2d 573, 577 (7th Cir. 1972)).
We agree with the district court, however, that NALC was not entitled to intervene as a matter of right under Rule 24(a)(2), and we find no abuse of the district court’s discretion in denying permissive intervention under Rule 24(b)(2).
[191]*191In order to establish its right to intervene under Rule 24(a)(2), NALC had to establish that its application was timely, > that it had an interest in the subject of the/ action, that disposition of the action might as a practical matter impair its interest, and • that representation of its interest by exist-/ ing parties might be inadequate. See 7A C. Wright & A. Miller, Federal Practice and Procedure § 1909 & Supp.1977. Because NALC failed to show any inadequacy of representation and because this failure is dispositive of this appeal, we see no need to address the other requirements of the Rule.
An applicant for intervention as of right has the burden of showing that representation may be inadequate, although the burden “should be treated as minimal.” Trbovich v. United Mine Workers, 404 U.S. 528, 538 n.10, 92 S.Ct. 630 (1972). The applicant must at least overcome the presumption of adequate representation that arises when it has the same ultimate objective as a party to the existing suit. Commonwealth - of Virginia v. Westinghouse Electric Corp., 542 F.2d 214, 216 (4th Cir. 1976); Ordnance Container Corp. v. Sperry Rand Corp., 478 F.2d 844, 845 (5th Cir. 1973). The issue before the district court was strictly one of law — either the challenged statutes were constitutional or they were not. The Postal Service has been represented throughout by the United States Attorney for'the Western District of New York pursuant to 39 U.S.C. § 409(d).2 Appellants did not contend that the United States Attorney’s Office would not advance all of the appropriate legal arguments in favor of constitutionality. Moreover, the Postal Service, a semi-private corporation, had as direct a legal and economic interest in the constitutionality of its monopoly as did NALC.
In a case which was an obvious candidate for summary judgment, there was no question of a possible conflict in trial strategies. The argument by NALC that it would have sought preliminary injunctive relief where the Postal Service did not is unpersuasive. Irreparable injury is the sine qua non for the grant of preliminary in-junctive relief. See Sampson v. Murray, 415 U.S. 61, 88, 94 S.Ct. 937, 39 L.Ed.2d 166 (1974); Oburn v. Shapp, 521 F.2d 142, 150-51 (3d Cir. 1975). Such loss of income as appellant’s 200,000 members conceivably might have sustained as a result of the Brennan’s small operation hardly rises to the stature of irreparable injury. Sampson, 415 U.S. at 90, 94 S.Ct. 937; Oburn, 521 F.2d at 151. The fact that this Court has twice granted a stay of the district court’s permanent injunction order in the face of NALC’s argument of irreparable harm indicates that this argument is without substance. Moreover, we fail to see what NALC would have gained by intervening and superimposing a motion for a preliminary injunction upon the Postal Service’s motion for summary judgment which was intended to secure the same relief.
Determination of the adequacy of existing representation necessarily involves an assessment of factors which are within the discretion of the district court. Rios v. Enterprise Association Steamfitters Local Union # 638, 520 F.2d 352, 355 (2d Cir. 1975); Chance v. Board of Education,
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VAN GRAAFEILAND, Circuit Judge:
This is an appeal from an order of the United States District Court for the Western District of New York denying a Rule 24 application to intervene. We affirm.
In February 1977, Patricia Brennan and J. Paul Brennan, a young couple in Rochester, New York, undertook the somewhat awesome task of disputing with the United States Postal Service the constitutionality of the Private Express Statutes and applicable Postal Service Regulations. 18 U.S.C. §§ 1693-99, 1724; 39 U.S.C. §§ 601-06; 39 C.F.R. §§ 310, 320. The dispute arose out of the Service’s action seeking permanently to enjoin the Brennans from running a small mail delivery business in the downtown Rochester area.
The only issue raised by the pleadings was one of law. The Brennans admitted the material facts alleged in the complaint and predicated their defense solely on the asserted unconstitutionality of the statutes. The case was therefore an appropriate one for summary'. judgment, and plaintiff moved for that disposition. At the time plaintiff’s motion was made, the- district court was considering an application to intervene filed by the National Association of Letter Carriers (NALC), a national labor union which acts as the bargaining agent tor some 200,000 employees of the Postal Service. Following plaintiff’s motion, the district court denied the application to intervene and thereafter granted summary judgment in favor of the Postal Service.1
Although we affirm the order denying intervention, we do not agree with the district court that NALC had no standing to assert its proposed claim. “[T]he question of standing in the federal courts is to be considered in the framework of Article III which restricts judicial power to ‘cases’ and ‘controversies.’ ” Association of Data Processing Service Organizations, Inc. v. Camp, 397 U.S. 150, 151, 90 S.Ct. 827, 828, 25 L.Ed.2d 184 (1970); see also Sierra Club v. Morton, 405 U.S. 727, 732, 92 S.Ct. 1361, 31 L.Ed.2d 636 (1972). The existence of a case or controversy having been established as between the Postal Service and the Brennans, there was no need to impose the standing requirement upon the proposed intervenor. See Trbovich v. United Mine Workers, 404 U.S. 528, 536-39, 92 S.Ct. 630, 30 L.Ed.2d 686 (1972); Hodgson v. United Mine Workers, 153 U.S.App.D.C. 407, 473 F.2d 118 (1972); see also Shapiro, Some Thoughts on Intervention Before Courts, Agencies, and Arbitrators, 81 Harv.L.Rev. 721, 726-29 (1968) (cited with approval in Trbovich, 404 U.S. at 536 n.7, 92 S.Ct. 630 and in United States v. Board of School Commissioners, 466 F.2d 573, 577 (7th Cir. 1972)).
We agree with the district court, however, that NALC was not entitled to intervene as a matter of right under Rule 24(a)(2), and we find no abuse of the district court’s discretion in denying permissive intervention under Rule 24(b)(2).
[191]*191In order to establish its right to intervene under Rule 24(a)(2), NALC had to establish that its application was timely, > that it had an interest in the subject of the/ action, that disposition of the action might as a practical matter impair its interest, and • that representation of its interest by exist-/ ing parties might be inadequate. See 7A C. Wright & A. Miller, Federal Practice and Procedure § 1909 & Supp.1977. Because NALC failed to show any inadequacy of representation and because this failure is dispositive of this appeal, we see no need to address the other requirements of the Rule.
An applicant for intervention as of right has the burden of showing that representation may be inadequate, although the burden “should be treated as minimal.” Trbovich v. United Mine Workers, 404 U.S. 528, 538 n.10, 92 S.Ct. 630 (1972). The applicant must at least overcome the presumption of adequate representation that arises when it has the same ultimate objective as a party to the existing suit. Commonwealth - of Virginia v. Westinghouse Electric Corp., 542 F.2d 214, 216 (4th Cir. 1976); Ordnance Container Corp. v. Sperry Rand Corp., 478 F.2d 844, 845 (5th Cir. 1973). The issue before the district court was strictly one of law — either the challenged statutes were constitutional or they were not. The Postal Service has been represented throughout by the United States Attorney for'the Western District of New York pursuant to 39 U.S.C. § 409(d).2 Appellants did not contend that the United States Attorney’s Office would not advance all of the appropriate legal arguments in favor of constitutionality. Moreover, the Postal Service, a semi-private corporation, had as direct a legal and economic interest in the constitutionality of its monopoly as did NALC.
In a case which was an obvious candidate for summary judgment, there was no question of a possible conflict in trial strategies. The argument by NALC that it would have sought preliminary injunctive relief where the Postal Service did not is unpersuasive. Irreparable injury is the sine qua non for the grant of preliminary in-junctive relief. See Sampson v. Murray, 415 U.S. 61, 88, 94 S.Ct. 937, 39 L.Ed.2d 166 (1974); Oburn v. Shapp, 521 F.2d 142, 150-51 (3d Cir. 1975). Such loss of income as appellant’s 200,000 members conceivably might have sustained as a result of the Brennan’s small operation hardly rises to the stature of irreparable injury. Sampson, 415 U.S. at 90, 94 S.Ct. 937; Oburn, 521 F.2d at 151. The fact that this Court has twice granted a stay of the district court’s permanent injunction order in the face of NALC’s argument of irreparable harm indicates that this argument is without substance. Moreover, we fail to see what NALC would have gained by intervening and superimposing a motion for a preliminary injunction upon the Postal Service’s motion for summary judgment which was intended to secure the same relief.
Determination of the adequacy of existing representation necessarily involves an assessment of factors which are within the discretion of the district court. Rios v. Enterprise Association Steamfitters Local Union # 638, 520 F.2d 352, 355 (2d Cir. 1975); Chance v. Board of Education, 496 F.2d 820, 826 (2d Cir. 1974). We find no abuse of that discretion in this case.
Permissive intervention is wholly discretionary with the trial court. The principal consideration set forth in the Rule is “whether the intervention will unduly delay or prejudice the adjudication of the rights of the original parties.” The court also will consider whether the applicant will benefit by intervention. See generally 7A Wright and Miller, supra, § 1913. Other relevant factors “include the nature and extent of the intervenors’ interests,” whether their interests are “adequately represented by the other parties,” and “whether par[192]*192ties seeking intervention will significantly contribute to full development of the underlying factual issues in the suit and to the just and equitable adjudication of the legal questions presented.” Spangler v. Pasadena City Board of Education, 552 F.2d 1326, 1329 (9th Cir. 1977) (footnote omitted). The decision of the trial court may only be disturbed for clear abuse of discretion. 7A Wright & Miller, supra, § 1923 at 630. The trial court’s discretion is very broad; indeed, we have not found a single case in which a denial of permissive intervention under Rule 24(b) was reversed solely for an abuse of discretion. We see no reason to start with this case.
The decision of the trial court is affirmed.