The Congress has to agree with treaties. If they don't it cannot be made.
Senate
The Senate
Congress
two thirds of the Senate
The president does the foreign policy stuff.
The U. S. Senate must ratify all treaties.
The Senate has the important job of approving treaties made by the president.
The president can make treaties, but Congress must ratify them.
They must meet with the other countries, work out the details and agree to it, finalize the treaty into a bill of sorts, and the Senate must confirm it with a vote of 2/3. Pretty cut-and-dry.
The president can negotiate treaties, but they must be ratified by the senate to go into effect. He can appoint ambassadors, and they also must be approved by the senate.
The Secretary of State negotiates treaties but they must be approved by the President and ratified by the Senate.
Congressn m8