Answer: The hat of CHIEF DIPLOMAT
Further details:
The various "hats" worn by the President, according to an article by Scholastic on "Seven Roles for One President," are these:
- Chief of State
- Chief Executive
- Chief Diplomat
- Commander in Chief
- Legislative Leader
- Chief of Party
- Guardian of the Economy
In regard to the President's role as Chief Diplomat, Article II, Section 2 of the Constitution gives him that authority -- with the advice and consent of the Senate. That section of the Constitution says of the President, "He shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two thirds of the Senators present concur."
The advice and consent of the Senate typically comes after the treaty has been negotiated by the President. As reported by Justia (a legal information site), "The Senate’s role in relation to treaties is essentially legislative in character." In a Supreme Court decision in 1936, this was affirmed by the Court's decision, which said, that the President "alone negotiates. Into the field of negotiation, the Senate cannot intrude" (United States v. Curtiss-Wright Export Corp., 1936). However, for the treaty to become active, the President must secure approval by the Senate, with a two-thirds majority vote, as stipulated by the Constitution.