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engaging in direct diplomacy with foreign heads of state and their ministers. The Constitution thus assigns the President means to effect recognition on his own initiative. Congress, by contrast, has no constitutional power that would enable it to initiate diplomatic relations with a foreign nation. Because these specific Clauses confer the recognition power on the President, the Court need not consider whether or to what extent the Vesting Clause, which provides that the “executive Power” shall be vested in the President, provides further support for the President's action here. Art. II, § 1, cl. 1.

The text and structure of the Constitution grant the President the power to recognize foreign nations and governments. The question then becomes whether that power is exclusive. The various ways in which the President may unilaterally effect recognition—and the lack of any similar power vested in Congress—suggest that it is. So, too, do functional considerations. Put simply, the Nation must have a single policy regarding which governments are legitimate in the eyes of the United States and which are not. Foreign countries need to know, before entering into diplomatic relations or commerce with the United States, whether their ambassadors will be received; whether their officials will be immune from suit in federal court; and whether they may initiate lawsuits here to vindicate their rights. These assurances cannot be equivocal.

Recognition is a topic on which the Nation must “`speak. . . with one voice.'” ''American Ins. Assn. v. Garamendi, 539 U. S. 396, 424 (2003) (quoting Crosby v. National Foreign Trade Council'', 530 U. S. 363, 381 (2000)). That voice must be the President's. Between the two political branches, only the Executive has the characteristic of unity at all times. And with unity comes the ability to exercise, to a greater degree, “[d]ecision, activity, secrecy, and dispatch.” The Federalist No. 70, p. 424 (A. Hamilton). The President is