The president’s authority in foreign affairs, as in all areas, is rooted in Article II of the Constitution.Presidents also rely on other clauses to support their foreign policy actions, particularly those that bestow “executive power” and the role of “commander in chief of the army and navy” on the office. From this language springs a wide array of associated or “implied” powersFor instance, the International Emergency Economic Powers Act (1977) authorizes the president to impose economic sanctions on foreign entities.Presidents also cite case law to support their claims of authority. In particular, two U.S. Supreme Court decisions—United States. v. Curtiss-Wright Export Corporation (1936) and Youngstown Sheet & Tube Company v. Sawyer (1952)—are touchstones.Council on Foreign Relations.

As President I wanted to share with Russia (at an openly scheduled W.H. meeting) which I have the absolute right to do, facts pertaining....

— Donald J. Trump (@realDonaldTrump) May 16, 2017