Article II gives this information . See the related question for more detail.
The US Constitution states the powers of the President. Laws passed by Congress and court decisions have since defined more exactly the powers of the president.
The Peolpe(us).
separation of powers
Article II, which provides for the powers of the Executive Branch
The president gets his authority from the US Constitution as interpreted by the Supreme Court. Conducting foreign policy is one of his duties, to be shared with the US Senate.
These are called inherent powers. They are provided for in the Constitution by what is known as the "elastic clause."
The US Constitution divides the foreign policy powers between the President and Congress so both share in foreign policy.
Article 1 Section 8 of the Constitution of the United States lists eighteen "enumerated powers" of the Congress. The 9th and 10th Amendments, as part of the Bill of Rights, specifically limit the Congress from taking actions that are not explicitly authorized, stating that powers not listed are reserved to the People or to the States.
The President has express powers under Article II of the US Constitution. They are that the President is the Commander in Chief of the US Military and the power to take care that the laws of the US be faithfully executed.
The United States Congress can, Impeach a President, Impeach a Supreme Court Judge, and Declare War. They also have many more powers. Their powers are found in Article I of The United States Constitution.
Article II of the Constitution deals mainly with the powers and duties of the President who heads the executive branch of the US government.
If the president is unable to perform his duties, there is a procedure for giving his powers temporarily to the vice-president. See amendment 25 to the US constitution.