The President of the United States of America is the head of state and head of government of the United States and is the highest political office in United States by influence and recognition. The President is at the head of the executive branch of the federal government, whose role is to enforce national law as given in the Constitution and written by Congress. Article Two of the Constitution establishes the President as commander-in-chief of the armed forces and enumerates powers specifically granted to the President, including the power to sign into law or veto bills passed by both houses of Congress.