Senate
The Senate ratifies treaties entered into by the executive branch of government.
Article 2 section 2 of the US constitution "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; and he shall nominate, and by and with the Advice and Consent of the Senate, shall appoint Ambassadors, other public Ministers and Consuls, Judges of the supreme Court, and all other Officers of the United States, whose Appointments are not herein otherwise provided for, and which shall be established by Law: but the Congress may by Law vest the Appointment of such inferior Officers, as they think proper, in the President alone, in the Courts of Law, or in the Heads of Departments."
The Congress has to agree with treaties. If they don't it cannot be made.
"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"...
Congress
Treaties made by the United States with a foreign power must be ratified by Congress.
The Senate
The Senate has the important job of approving treaties made by the president.
two thirds of the Senate
The Senate must approve treaties and presidential appointments.
It has to approve treaties made by the president.
It must be approved by the senate foreign regulations.