Answer:
The President has the power to make treaties because the United States Constitution grants this authority to the President in Article II, Section 2. The Constitution states that the President shall have power, by and with the advice and consent of the Senate, to make treaties, provided two thirds of the Senators present concur. This means that the President can negotiate and sign treaties, but those treaties cannot go into effect until two-thirds of the Senate approves them. This is meant to provide an additional layer of protection for the interests of the United States by ensuring that the Senate has a say in the ratification of treaties.