According to the Constitution, it is only the Senate that has the authority to approve international treaties. The house has no say and it is usually left to the President to take credit for a new treaty.
In the United States the executive branch of government negotiates treaties with other nations. The US Senate must vote to approve any treaty negotiated by the executive branch. Often times the US President negotiates treaties, in other cases this duty is carried out by a top US Official such as the US Secretary of State with the approval of the President. Then the treaty is sent to the senate.
This is the purview of the executive branch of government. It flows from the president (or prime minister, in a parliamentary democracy; or dictator in an autocracy) down through the Department of State (of foreign affairs office, in other countries), then to embassy personnel stationed in countries with which there exists a positive reciprocal relationship (and not, for instance, between the U.S. and North Korea).
The president but it must be approved first by congress.
The president has ultimate authority over foreign policy but the U.S. Secretary of State is analogous to the foreign minister of other nations and has official state-to-state diplomacy.
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The US President has the Constitutional authority to make foreign policy, with the advice of the Senate, who must approve all treaties.
It is President.
The legislative branch
The power to make war. The power to negotiate or agree to treaties with foreign nations. All these are in Article Four, which includes a prohibition of one state discriminating against the citizens of another state, for instance by making criminal penalties more severe for non-citizens than for citizens.
The president! Article II. Section 2 of the Constitution says: 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.
Under Article II, Section 2, Clause 2 of the Constitution, the President has the power to make treaties with foreign governments, so long as two-thirds of the Senators present during the ratification process concur.
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The president, with the advice and consent of the senate.