opinion: Mr. Justice Minton
  delivered the opinion of the Court.
  May the United States exclude without hearing, solely upon a finding by the Attorney General that her admission would be prejudicial to the interests of the United States, the alien wife of a citizen who had served honorably in the armed forces of the United States during World War II? The District Court for the Southern District of New York held that it could, and the Court of Appeals for the Second Circuit affirmed. 173 F. 2d 599. We granted certiorari to examine the question especially in the light of the War Brides Act of December 28, 1945. 336 U. S. 966.
  Petitioner was born in Germany in 1915. She left Germany and went to Czechoslovakia during the Hitler regime. There she was married and divorced. She went to England in 1939 as a refugee. Thereafter she served with the Royal Air Force efficiently and honorably from January 1, 1943, until May 30, 1946. She then secured civilian employment with the War Department of the United States in Germany. Her work was rated “very good” and “excellent.” On February 28, 1948, with the permission of the Commanding General at Frankfurt, Germany, she married Kurt W. Knauff, a naturalized citizen of the United States. He is an honorably discharged United States Army veteran of World War II. He is, as he was at the time of his marriage, a civilian employee of the United States Army at Frankfurt, Germany.
  On August 14, 1948, petitioner sought to enter the United States to be naturalized. On that day she was temporarily excluded from the United States and detained at Ellis Island. On October 6, 1948, the Assistant Commissioner of Immigration and Naturalization recommended that she be permanently excluded without a hearing on the ground that her admission would be prejudicial to the interests of the United States. On the same day the Attorney General adopted this recommendation and entered a final order of exclusion. To test the right of the Attorney General to exclude her without a hearing for security reasons, habeas corpus proceedings were instituted in the Southern District of New York, based primarily on provisions of the War Brides Act. The District Court dismissed the writ, and the Court of Appeals affirmed.
  The authority of the Attorney General to order the exclusion of aliens without a hearing flows from the Act of June 21, 1941, amending § 1 of the Act of May 22, 1918 (55 Stat. 252, 22 U. S. C. § 223). By the 1941 amendment it was provided that the President might, upon finding that the interests of the United States required it, impose additional restrictions and prohibitions on the entry into and departure of persons from the United States during the national emergency proclaimed May 27, 1941. Pursuant to this Act of Congress the President on November 14, 1941, issued Proclamation 2523 (3 CFR, 1943 Cum. Supp., 270-272). This proclamation recited that the interests of the United States required the imposition of additional restrictions upon the entry into and departure of persons from the country and authorized the promulgation of regulations jointly by the Secretary of State and the Attorney General. It was also provided that no alien should be permitted to enter the United States if it were found that such entry would be prejudicial to the interests of the United States.
  Pursuant to the authority of this proclamation the Secretary of State and the Attorney General issued regulations governing the entry into and departure of persons from the United States during the national emergency. Subparagraphs (a) to (k) of § 175.53 of these regulations specified the classes of aliens whose entry into the United States was deemed prejudicial to the public interest. Subparagraph (b) of § 175.57 provided that the Attorney General might deny an alien a hearing before a board of inquiry in special cases where he determined that the alien was excludable under the regulations on the basis of information of a confidential nature, the disclosure of which would be prejudicial to the public interest.
  It was under this regulation § 175.57 (b) that petitioner was excluded by the Attorney General and denied a hearing. We are asked to pass upon the validity of this action.
  At the outset we wish to point out that an alien who seeks admission to this country may not do so under any claim of right. Admission of aliens to the United States is a privilege granted by the sovereign United States Government. Such privilege is granted to an alien only upon such terms as the United States shall prescribe. It must be exercised in accordance with the procedure which the United States provides. Nishimura Ekiu v. United States, 142 U. S. 651, 659; Fong Yue Ting v. United States, 149 U. S. 698, 711.
  Petitioner contends that the 1941 Act and the regulations thereunder are void to the extent that they contain unconstitutional delegations of legislative power. But there is no question of inappropriate delegation of legislative power involved here. The exclusion of aliens is a fundamental act of sovereignty. The right to do so stems not alone from legislative power but is inherent in the executive power to control the foreign affairs of the nation. United States v. Curtiss-Wright Export Corp., 299 U. S. 304; Fong Yue Ting v. United States, 149 U. S. 698, 713. When Congress prescribes a procedure concerning the admissibility of aliens, it is not dealing alone with a legislative power. It is implementing an inherent executive power.
  Thus the decision to admit or to exclude an alien may be lawfully placed with the President, who may in turn delegate the carrying out of this function to a responsible executive officer of the sovereign, such as the Attorney General. The action of the executive officer under such authority is final and conclusive. Whatever the rule may be concerning deportation of persons who have gained entry into the United States, it is not within the province of any court, unless expressly authorized by law, to review the determination of the political branch of the Government to exclude a given alien. Nishimura Ekiu v. United States, 142 U. S. 651, 659-660; Fong Yue Ting v. United States, 149 U. S. 698, 713-714; Ludecke v. Watkins, 335 U. S. 160. Cf. Yamataya v. Fisher, 189 U. S. 86, 101. Normally Congress supplies the conditions of the privilege of entry into the United States. But because the power of exclusion of aliens is also inherent in the executive department of the sovereign, Congress may in broad terms authorize the executive to exercise the power, e. g., as was done here, for the best interests of the country during a time of national emergency. Executive officers may be entrusted with the duty of specifying the procedures for carrying out the congressional intent. What was said in Lichter v. United States, 334 U. S. 742, 785, is equally appropriate here:
  “It is not necessary that Congress supply administrative officials with a specific formula for their guidance in a field where flexibility and the adaptation of the congressional policy to infinitely variable conditions constitute the essence of the program. . . . Standards prescribed by Congress are to be read in the light of the conditions to which they are to be applied. ‘They derive much meaningful content from the purpose of the Act, its factual background and the statutory context in which they appear.’ ”
  Whatever the procedure authorized by Congress is, it is due process as far as an alien denied entry is concerned. Nishimura Ekiu v. United States, supra; Ludecke v. Watkins, supra.
  In the particular circumstances of the instant case the Attorney General, exercising the discretion entrusted to him by Congress and the President, concluded upon the basis of confidential information that the public interest required that petitioner be denied the privilege of entry into the United States. He denied her a hearing on the matter because, in his judgment, the disclosure of the information on which he based that opinion would itself endanger the public security.
  We find no substantial merit to petitioner’s contention that the regulations were not “reasonable” as they were required to be by the 1941 Act. We think them reasonable in the circumstances of the period for which they were authorized, namely, the national emergency of World War II. Nor can we agree with petitioner’s assertion that Proclamation 2523 (see note 2, supra) authorized only the Secretary of State, and not the Attorney General, to order the exclusion of aliens. See Presidential Proclamation 2850 of August 17, 1949 (14 Fed. Reg. 5173), amending and clarifying Proclamation 2523. We reiterate that we are dealing here with a matter of privilege. Petitioner had no vested right of entry which could be the subject of a prohibition against retroactive operation of regulations affecting her status.
  It is not disputed that the Attorney General’s action was pursuant to the 8 CFR regulations heretofore discussed. However, 22 U. S. C. § 223, authorizes these special restrictions on the entry of aliens only when the United States is at war or during the existence of the national emergency proclaimed May 27, 1941. For ordinary times Congress has provided aliens with a hearing. 8 U. S. C. §§ 152, 153. And the contention of petitioner is that she is entitled to the statutory hearing because for purposes of the War Brides Act, within which she comes, the war terminated when the President proclaimed the cessation of hostilities. She contends that the War Brides Act, applicable portions of which are set out in the margin, discloses a congressional intent that special restrictions on the entry of aliens should cease to apply to war brides upon the cessation of hostilities.
  The War Brides Act provides that World War II is the period from December 7, 1941, until the proclaimed termination of hostilities. This has nothing to do with the period for which the regulations here acted under were authorized. The beginning and end of the war are defined by the War Brides Act, we assume, for the purpose of ascertaining the period within which citizens must have served in the armed forces in order for their spouses and children to be entitled to the benefits of the Act. The special procedure followed in this case was authorized not only during the period of actual hostilities but during the entire war and the national emergency proclaimed May 27, 1941. The national emergency has never been terminated. Indeed, a state of war still exists. See Woods v. Miller Co., 333 U. S. 138, n. 3. Thus, the authority upon which the Attorney General acted remains in force. The Act of June 21, 1941, and the President’s proclamations and the regulations thereunder are still a part of the immigration laws.
  The War Brides Act does not relieve petitioner of her alien status. Indeed, she sought admission in order to be naturalized and thus to overcome her alien status. The Act relieved her of certain physical, mental, and documentary requirements and of the quota provisions of the immigration laws. But she must, as the Act requires, still be “otherwise admissible under the immigration laws.” In other words, aside from the enumerated relaxations of the immigration laws she must be treated as any other alien seeking admission. Under the immigration laws and regulations applicable to all aliens seeking entry into the United States during the national emergency, she was excluded by the Attorney General without a hearing. In such a case we have no authority to retry the determination of the Attorney General. Ludecke v. Watkins, 335 U. S. 160, 171-172.
  There is nothing in the War Brides Act or its legislative history to indicate that it was the purpose of Congress, by partially suspending compliance with certain requirements and the quota provisions of the immigration laws, to relax the security provisions of the immigration laws. There is no indication that Congress intended to permit members or former members of the armed forces to marry and bring into the United States aliens that the President, acting through the Attorney General in the performance of his sworn duty, found should be denied entry for security reasons. As all other aliens, petitioner had to stand the test of security. This she failed to meet. We find no legal defect in the manner of petitioner’s exclusion, and the judgment is
  Affirmed.
  Mr. Justice Douglas and Mr. Justice Clark took no part in the consideration or decision of this case.
  “When the United States is at war or during the existence of the national emergency proclaimed by the President on May 27, 1941, or as to aliens whenever there exists a state of war between, or among, two or more states, and the President shall find that the interests of the United States require that restrictions and prohibitions in addition to those provided otherwise than by this Act be imposed upon the departure of persons from and their entry into the United States, and shall make public proclamation thereof, it shall, until otherwise ordered by the President or Congress, be unlawful—
  “(a) For any alien to depart from or enter or attempt to depart from or enter the United States except under such reasonable rules, regulations, and orders, and subject to such limitations and exceptions as the President shall prescribe
  “(3) After the effective date of the rules and regulations hereinafter authorized, no alien shall enter or attempt to enter the United States unless he is in possession of a valid unexpired permit to enter issued by the Secretary of State, or by an appropriate officer designated by the Secretary of State, or is exempted from obtaining a permit to enter in accordance with the rules and regulations which the Secretary of State, with the concurrence of the Attorney General, is hereby authorized to prescribe in execution of these rules, regulations, and orders.
  “No alien shall be permitted to enter the United States if it appears to the satisfaction of the Secretary of State that such entry would be prejudicial to the interests of the United States as provided in the rules and regulations hereinbefore authorized to be prescribed by the Secretary of State, with the concurrence of the Attorney General.” 3 CFR, 1943 Cum. Supp., 271.
  “In the case of an alien temporarily excluded by an official of the Department of Justice on the ground that he is, or may be, excludable under one or more of the categories set forth in § 175.53, no hearing by a board of special inquiry shall be held until after the case is reported to the Attorney General and such a hearing is directed by the Attorney General or his representative. In any special case the alien may be denied a hearing before a board of special inquiry and an appeal from the decision of that board if the Attorney General determines that he is excludable under one of the categories set forth in § 175.53 on the basis of information of a confidential nature, the disclosure of which would be prejudicial to the public interest.” 8 CFR, 1945 Supp., § 175.57 (b).
  See note 3, supra.
  See note 1, supra.
  And at certain other times not material here.
  Proclamation 2714 of December 31, 1946, 3 CFR, 1946 Supp., 77.
  “That notwithstanding any of the several clauses of section 3 of the Act of February 5, 1917, excluding physically and mentally defective aliens, and notwithstanding the documentary requirements of any of the immigration laws or regulations, Executive orders, or Presidential proclamations issued thereunder, alien spouses or alien children of United States citizens serving in, or having an honorable discharge certificate from the armed forces of the United States during the Second World War shall, if otherwise admissible under the immigration laws and if application for admission is made within three years of the effective date of this Act, be admitted to the United States ....
  “Sec. 2. Regardless of section 9 of the Immigration Act of 1924, any alien admitted under section 1 of this Act shall be deemed to be a nonquota immigrant as defined in section 4 (a) of the Immigration Act of 1924.
  . . . . .
  “Sec. 5. For the purpose of this Act, the Second World War shall be deemed to have commenced on December 7, 1941, and to have ceased upon the termination of hostilities as declared by the President or by a joint resolution of Congress.” 59 Stat. 659, 8 U. S. C. §§ 232-236.
  See H. R. Rep. No. 1320, 79th Cong., 1st Sess. (1945); S. Rep. No. 860, 79th Cong., 1st Sess. (1945); 91 Cong. Rec. 11738, 12342 (1945).
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