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The Senate.
US Senate
Because the Senate must ratify treaties with a super majority.
It depends on the constitution, if any, and the legislation of the country in question.
The Constitution requires the Senate to ratify treaties. Until the Senate approves them, they are not in force. The Senate does not automatically approve all treaties that the President sends to them.
William Paterson who came up with the new jersey plan was the second person to ratify the constitution.
Me
According the United States Constitution, the US Senate can refuse the president's appointments. It can also reject treaties that have been agreed to by the president.
The Legislative Branch can ratify treaties; The Senate approves Presidential Appointments
ratify
The Congress
Congress can