The president must be at least 35 years old, a natural-born citizen, and have lived in the United States at least 14 years. His yearly salary is $400,000.
The Constitution assigns the president two roles: chief executive of the federal government and Commander in Chief of the armed forces. As Commander in Chief, the president has the authority to send troops into combat, and is the only one who can decide whether to use nuclear weapons.
As chief executive, he enforces laws, treaties, and court rulings; develops federal policies; prepares the national budget; and appoints federal officials. He also approves or vetoes acts of Congress and grants pardons.
If a president dies, resigns, is disabled, or is removed from office, the Vice president assumes the office. This has occurred nine times.