Mr. Justice Powell
delivered the opinion of the Court.
This case brings before us a constitutional challenge to §§ 101 (b) (1) (D) and 101 (b) (2) of the Immigration and Nationality Act of 1952 (Act), 66 Stat. 182, as amended, 8 U. S. C. §§ 1101 (b) (1) (D) and 1101 (b) (2).
I
The Act grants special preference immigration status to aliens who qualify as the “children” or “parents” of United States citizens or lawful permanent residents. Under § 101 (b) (1), a “child” is defined as an unmarried person under 21 years of age who is a legitimate or legitimated child, a stepchild, an adopted child, or an illegitimate child seeking preference by virtue of his relationship with his natural mother.1 [789]*789The definition does not extend to an illegitimate child seeking preference by virtue of his relationship with his natural father. Moreover, under § 101 (b) (2), a person qualifies as a “parent” for purposes of the Act solely on the basis of the person’s relationship with a “child.” As a result, the natural father of an illegitimate child who is either a United States citizen or permanent resident alien is not entitled to preferential treatment as a “parent.”
The special preference immigration status provided for those who satisfy the statutory “parent-child” relationship depends on whether the immigrant’s relative is a United States citizen or permanent resident alien. A United States citizen is allowed the entry of his “parent” or “child” without regard to either an applicable numerical quota or the labor certification requirement. 8 U. S. C. §§ 1151 (a), (b), 1182 (a) (14). On the other hand, a United States permanent resident alien is allowed the entry of the “parent” or “child” subject to numerical limitations but without regard to the labor certifi[790]*790cation requirement. 8 U. S. C. § 1182 (a) (14); see 1 C. Gordon & H. Rosenfield, Immigration Law and Procedure § 2.40 n. 18 (rev. ed. 1975).2
Appellants are three sets of unwed natural fathers and their illegitimate offspring who sought, either as an alien father or an alien child, a special immigration preference by virtue of a relationship to a citizen or resident alien child or parent. In each instance the applicant was informed that he was ineligible for an immigrant visa unless he qualified for admission under the general numerical limitations and, in the case of the alien parents, received the requisite labor certification.3
[791]*791Appellants filed this action in July 1974 in the United States District Court for the Eastern District of New York challenging the constitutionality of §§ 101 (b)(1) and 101 (b) (2) of the Act under the First, Fifth, and Ninth Amendments. Appellants alleged that the statutory provisions (i) denied them equal protection by discriminating against natural fathers and their illegitimate children “on the basis of the father’s marital status, the illegitimacy of the child and the sex of the parent without either compelling or rational justification”; (ii) denied them due process of law to the extent that there was established “an unwarranted conclusive presumption of the absence of strong psychological and economic ties between natural fathers and their children born out of wedlock and not legitimated”; and (iii) “seriously burden[ed] and infringe [d] upon the rights of natural fathers and their children, born out of wedlock and not legitimated, to mutual association, to privacy, to establish a home, to raise natural children and to be raised by the natural father.” App. 11-12. Appellants sought to enjoin permanently enforcement of the challenged statutory provisions to the extent that the statute precluded them from qualifying for the special preference accorded other “parents” and “children.”
A three-judge District Court was convened to consider the constitutional issues. After noting that Congress’ power to fashion rules for the admission of aliens was “exceptionally broad,” the District Court held, with one judge dissenting, that the statutory provisions at issue were neither “wholly devoid of any conceivable rational purpose” nor “fundamentally aimed at achieving a goal unrelated to the regulation of immigration.” Fiallo v. Levi, 406 F. Supp. 162, 165, 166 [792]*792(1975). The court therefore granted judgment for the Government and dismissed the action.
We noted probable jurisdiction sub nom. Fiallo v. Levi, 426 U. S. 919 (1976), and for the reasons set forth below we affirm.
II
At the outset, it is important to underscore the limited scope of judicial inquiry into immigration legislation. This Court has repeatedly emphasized that “over no conceivable subject is the legislative power of Congress more complete than it is over” the admission of aliens. Oceanic Navigation Co. v. Stranahan, 214 U. S. 320, 339 (1909); accord, Kleindienst v. Mandel, 408 U. S. 753, 766 (1972). Our cases “have long recognized the power to expel or exclude aliens as a fundamental sovereign attribute exercised by the Government's political departments largely immune from judicial control.” Shaughnessy v. Mezei, 345 U. S. 206, 210 (1953); see, e. g., Harisiades v. Shaughnessy, 342 U. S. 580 (1952); Lem Moon Sing v. United States, 158 U. S. 538 (1895); Fong Yue Ting v. United States, 149 U. S. 698 (1893); The Chinese Exclusion Case, 130 U. S. 581 (1889). Our recent decisions have not departed from this long-established rule. Just last Term, for example, the Court had occasion to note that “the power over aliens is of a political character and therefore subject only to narrow judicial review.” Hampton v. Mow Sun Wong, 426 U. S. 88, 101 n. 21 (1976), citing Fong Yue Ting v. United States, supra, at 713; accord, Mathews v. Diaz, 426 U. S. 67, 81-82 (1976). And we observed recently that in the exercise of its broad power over immigration and naturalization, “Congress regularly makes rules that would be unacceptable if applied to citizens.” Id., at 80.4
[793]*793Appellants apparently do not challenge the need for special judicial deference to congressional policy choices in the immigration context,5 but instead suggest that a “unique coalescing of factors” makes the instant case sufficiently unlike prior immigration cases to warrant more searching judicial scrutiny. Brief for Appellants 52-55.
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Mr. Justice Powell
delivered the opinion of the Court.
This case brings before us a constitutional challenge to §§ 101 (b) (1) (D) and 101 (b) (2) of the Immigration and Nationality Act of 1952 (Act), 66 Stat. 182, as amended, 8 U. S. C. §§ 1101 (b) (1) (D) and 1101 (b) (2).
I
The Act grants special preference immigration status to aliens who qualify as the “children” or “parents” of United States citizens or lawful permanent residents. Under § 101 (b) (1), a “child” is defined as an unmarried person under 21 years of age who is a legitimate or legitimated child, a stepchild, an adopted child, or an illegitimate child seeking preference by virtue of his relationship with his natural mother.1 [789]*789The definition does not extend to an illegitimate child seeking preference by virtue of his relationship with his natural father. Moreover, under § 101 (b) (2), a person qualifies as a “parent” for purposes of the Act solely on the basis of the person’s relationship with a “child.” As a result, the natural father of an illegitimate child who is either a United States citizen or permanent resident alien is not entitled to preferential treatment as a “parent.”
The special preference immigration status provided for those who satisfy the statutory “parent-child” relationship depends on whether the immigrant’s relative is a United States citizen or permanent resident alien. A United States citizen is allowed the entry of his “parent” or “child” without regard to either an applicable numerical quota or the labor certification requirement. 8 U. S. C. §§ 1151 (a), (b), 1182 (a) (14). On the other hand, a United States permanent resident alien is allowed the entry of the “parent” or “child” subject to numerical limitations but without regard to the labor certifi[790]*790cation requirement. 8 U. S. C. § 1182 (a) (14); see 1 C. Gordon & H. Rosenfield, Immigration Law and Procedure § 2.40 n. 18 (rev. ed. 1975).2
Appellants are three sets of unwed natural fathers and their illegitimate offspring who sought, either as an alien father or an alien child, a special immigration preference by virtue of a relationship to a citizen or resident alien child or parent. In each instance the applicant was informed that he was ineligible for an immigrant visa unless he qualified for admission under the general numerical limitations and, in the case of the alien parents, received the requisite labor certification.3
[791]*791Appellants filed this action in July 1974 in the United States District Court for the Eastern District of New York challenging the constitutionality of §§ 101 (b)(1) and 101 (b) (2) of the Act under the First, Fifth, and Ninth Amendments. Appellants alleged that the statutory provisions (i) denied them equal protection by discriminating against natural fathers and their illegitimate children “on the basis of the father’s marital status, the illegitimacy of the child and the sex of the parent without either compelling or rational justification”; (ii) denied them due process of law to the extent that there was established “an unwarranted conclusive presumption of the absence of strong psychological and economic ties between natural fathers and their children born out of wedlock and not legitimated”; and (iii) “seriously burden[ed] and infringe [d] upon the rights of natural fathers and their children, born out of wedlock and not legitimated, to mutual association, to privacy, to establish a home, to raise natural children and to be raised by the natural father.” App. 11-12. Appellants sought to enjoin permanently enforcement of the challenged statutory provisions to the extent that the statute precluded them from qualifying for the special preference accorded other “parents” and “children.”
A three-judge District Court was convened to consider the constitutional issues. After noting that Congress’ power to fashion rules for the admission of aliens was “exceptionally broad,” the District Court held, with one judge dissenting, that the statutory provisions at issue were neither “wholly devoid of any conceivable rational purpose” nor “fundamentally aimed at achieving a goal unrelated to the regulation of immigration.” Fiallo v. Levi, 406 F. Supp. 162, 165, 166 [792]*792(1975). The court therefore granted judgment for the Government and dismissed the action.
We noted probable jurisdiction sub nom. Fiallo v. Levi, 426 U. S. 919 (1976), and for the reasons set forth below we affirm.
II
At the outset, it is important to underscore the limited scope of judicial inquiry into immigration legislation. This Court has repeatedly emphasized that “over no conceivable subject is the legislative power of Congress more complete than it is over” the admission of aliens. Oceanic Navigation Co. v. Stranahan, 214 U. S. 320, 339 (1909); accord, Kleindienst v. Mandel, 408 U. S. 753, 766 (1972). Our cases “have long recognized the power to expel or exclude aliens as a fundamental sovereign attribute exercised by the Government's political departments largely immune from judicial control.” Shaughnessy v. Mezei, 345 U. S. 206, 210 (1953); see, e. g., Harisiades v. Shaughnessy, 342 U. S. 580 (1952); Lem Moon Sing v. United States, 158 U. S. 538 (1895); Fong Yue Ting v. United States, 149 U. S. 698 (1893); The Chinese Exclusion Case, 130 U. S. 581 (1889). Our recent decisions have not departed from this long-established rule. Just last Term, for example, the Court had occasion to note that “the power over aliens is of a political character and therefore subject only to narrow judicial review.” Hampton v. Mow Sun Wong, 426 U. S. 88, 101 n. 21 (1976), citing Fong Yue Ting v. United States, supra, at 713; accord, Mathews v. Diaz, 426 U. S. 67, 81-82 (1976). And we observed recently that in the exercise of its broad power over immigration and naturalization, “Congress regularly makes rules that would be unacceptable if applied to citizens.” Id., at 80.4
[793]*793Appellants apparently do not challenge the need for special judicial deference to congressional policy choices in the immigration context,5 but instead suggest that a “unique coalescing of factors” makes the instant case sufficiently unlike prior immigration cases to warrant more searching judicial scrutiny. Brief for Appellants 52-55. Appellants first observe that since the statutory provisions were designed to reunite families wherever possible, the purpose of the statute was to afford rights not to aliens but to United States citizens and legal permanent residents. Appellants then rely on our border-search decisions in Almeida-Sanchez v. United States, 413 U. S. 266 (1973), and United States v. Brignoni-Ponce, 422 U. S. 873 (1975), for the proposition that the courts must [794]*794scrutinize congressional legislation in the immigration area to protect against violations of the rights of citizens. At issue in the border-search cases, however, was the nature of the protections mandated by the Fourth Amendment with respect to Government procedures designed to stem the illegal entry of aliens. Nothing in the opinions in those cases suggests that Congress has anything but exceptionally broad power to determine which classes of aliens may lawfully enter the country. See 413 U. S., at 272; 422 U. S., at 883-884.
Appellants suggest a second distinguishing factor. They argue that none of the prior immigration cases of this Court involved “double-barreled” discrimination based on sex and illegitimacy, infringed upon the due process rights of citizens and legal permanent residents, or implicated “the fundamental constitutional interests of United States citizens and permanent residents in a familial relationship.” Brief for Appellants 53-54; see id., at 16-18. But this Court has resolved similar challenges to immigration legislation based on other constitutional rights of citizens, and has rejected the suggestion that more searching judicial scrutiny is required. In Kleindienst v. Mandel, supra, for example, United States citizens challenged the power of the Attorney General to deny a visa to an alien who, as a proponent of “the economic, international, and governmental doctrines of World communism,” was ineligible to receive a visa under 8 U. S. C. § 1182 (a) (28) (D) absent a waiver by the Attorney General. The citizen-appellees in that case conceded that Congress could prohibit entry of all aliens falling into the class defined by § 1182 (a) (28) (D). They contended, however, that the Attorney General’s statutory discretion to approve a waiver was limited by the Constitution and that their First Amendment rights were abridged by the denial of Mandel’s request for a visa. The Court held that “when the Executive exercises this [delegated] power negatively on the basis of a facially legitimate and bona fide reason, the courts will neither look behind [795]*795the exercise of that discretion, nor test it by balancing its justification against the First Amendment interests of those who seek personal communication with the applicant.” 408 U. S., at 770. We can see no reason to review the broad congressional policy choice at issue here under a more exacting standard than was applied in Kleindienst v. Mandel, a First Amendment case.6
[796]*796Finally, appellants characterize our prior immigration cases as involving foreign policy matters and congressional choices to exclude or expel groups of aliens that were “specifically and clearly perceived to pose a grave threat to the national security,” citing Harisiades v. Shaughnessy, 342 U. S. 580 (1952), “or to the general welfare of this country,” citing Boutilier v. INS, 387 U. S. 118 (1967). Brief for Appellants 54. We find no indication in our prior cases that the scope of judicial review is a function of the nature of the policy choice at issue. To the contrary, “[s]ince decisions in these matters may implicate our relations with foreign powers, and since a wide variety of classifications must be defined in the light of changing political and economic circumstances, such decisions are frequently of a character more appropriate to either the Legislature or the Executive than to the Judiciary,” and “[t]he reasons that preclude judicial review of political questions also dictate a narrow standard of review of decisions made by the Congress or the President in the area of immigration and naturalization.” Mathews v. Diaz, 426 U. S., at 81-82. See Harisiades v. Shaughnessy, supra, at 588-589. As Mr. Justice Frankfurter observed in his concurrence in Harisiades v. Shaughnessy:
“The conditions of entry for every alien, the particular classes of aliens that shall be denied entry altogether, the basis for determining such classification, the right to terminate hospitality to aliens, the grounds on which such determination shall be based, have been recognized as matters solely for the responsibility of the Congress and wholly outside the power of this Court to control.” 342 U. S., at 596-597.
[797]*797III
As originally enacted in 1952, §101 (b) (1) of the Act defined a “child” as an unmarried legitimate or legitimated child or stepchild under 21 years of age. The Board of Immigration Appeals and the Attorney General subsequently concluded that the failure of this definition to refer to illegitimate children rendered ineligible for preferential nonquota status both the illegitimate alien child of a citizen mother, Matter of A, 5 I. & N. Dec. 272, 283-284 (A. G. 1953), and the alien mother of a citizen born out of wedlock, Matter of F, 7 I. & N. Dec. 448 (B. I. A. 1957). The Attorney General recommended that the matter be brought to the attention of Congress, Matter of A, supra, at 284, and the Act was amended in 1957 to include what is now 8 U. S. C. § 1101 (b) (1) (D). See n. 1, supra. Congress was specifically concerned with the relationship between a child born out of wedlock and his or her natural mother, and the legislative history of the 1957 amendment reflects an intentional choice not to provide preferential immigration status by virtue of the relationship between an illegitimate child and his or her natural father.7
This distinction is just one of many drawn by Congress pursuant to its determination to provide some—but not all—families with relief from various immigration restrictions that would otherwise hinder reunification of the family in this country. In addition to the distinction at issue here, Con[798]*798gress has decided that children, whether legitimate or not, cannot qualify for preferential status if they are married or are over 21 years of age. 8 U. S. C. § 1101 (b) (1). Legitimated children are ineligible for preferential status unless their legitimation occurred prior to their 18th birthday and at a time when they were in the legal custody of the legitimating parent or parents. § 1101 (b) (1) (C). Adopted children are not entitled to preferential status unless they were adopted before the age of 14 and have thereafter lived in the custody of their adopting or adopted parents for at least two years, § 1101 (b) (1) (E). And stepchildren cannot qualify unless they were under 18 at the time of the marriage creating the stepchild relationship. § 1101 (b) (1) (B).
With respect to each of these legislative policy distinctions, it could be argued that the line should have been drawn at a different point and that the statutory definitions deny preferential status to parents and children who share strong family ties. Cf. Mathews v. Diaz, supra, at 83-84. But it is clear from our cases, see Part II, supra, that these are policy questions entrusted exclusively to the political branches of our Government, and we have no judicial authority to substitute our political judgment for that of the Congress.
Appellants suggest that the distinction drawn in § 101 (b) (1) (D) is unconstitutional under any standard of review since it infringes upon the constitutional rights of citizens and legal permanent residents without furthering legitimate governmental interests. Appellants note in this regard that the statute makes it more difficult for illegitimate children and their natural fathers to be reunited in this country than for legitimate or legitimated children and their parents, or for illegitimate children and their natural mothers. And appellants also note that the statute fails to establish a procedure under which illegitimate children and their natural fathers could prove the existence and strength of their family relationship. Those are admittedly the consequences of the [799]*799congressional decision not to accord preferential status to this particular class of aliens, but the decision nonetheless remains one “solely for the responsibility of the Congress and wholly outside the power of this Court to control.” Harisiades v. Shaughnessy, 342 U. S., at 597 (Frankfurter, J., concurring). Congress obviously has determined that preferential status is not warranted for illegitimate children and their natural fathers, perhaps because of a perceived absence in most cases of close family ties as well as a concern with the serious problems of proof that usually lurk in paternity determinations.8 See Trimble v. Gordon, ante, at 771. In any event, it is not the judicial role in cases of this sort to probe and test the justifications for the legislative decision.9 Kleindienst v. Mandel, 408 U. S., at 770.
IV
We hold that §§ 101 (b) (1) (D) and 101 (b) (2) of the [800]*800Immigration and Nationality Act of 1952 are not unconstitutional by virtue of the exclusion of the relationship between an illegitimate child and his natural father from the preferences accorded by the Act to the “child” or “parent” of a United States citizen or lawful permanent resident.
Affirmed.