What exactly does the president do in the White House? The everyday citizen may understand that the President of the United States is the leader of the country but may not be able to explain all the duties and powers that come with this position. The United States Constitution specifically lists several roles and responsibilities for the president. Other presidential roles have developed as our country has grown and changed. Learn about the requirements to become president and how the president carries out some of the major duties of the position, including examples from history.