Eligibility for presidency requires candidates to be a natural-born citizen, thirty-five years old, and a permanent resident of the United States for fourteen years. Since the addition of the twenty-second amendment, no person can be elected more than twice. The amendment also states that if any eligible person who serves as president or acting president for more than two years of a term for which some other eligible person was elected president, they can only be elected president once. Under Article I, Section 3, Clause 7, upon conviction in impeachment cases, the Senate has the option of disqualifying convicted individuals from holding other federal offices, including the presidency. Under Section 3 of the Fourteenth Amendment, no person who swore an oath to support the Constitution, and later rebelled against the United States, can become president. However, this disqualification can be lifted by a two-thirds vote of each house of Congress.
Nomination is the first step to becoming president. Campaigning for the presidential election begins before the primary election. Normally at the national convention the delegates