Twenty-second Amendment to the United States Constitution
The amendment prohibits any individual who has been elected president twice from being elected again. Under the amendment, an individual who fills an unexpired presidential term lasting greater than two years is also prohibited from winning election as president more than once. Scholars debate whether the amendment prohibits affected individuals from succeeding to the presidency under any circumstances or whether it only applies to presidential elections.
Vice President of the United States
The term of office for both the vice president and the president is four years. While the Twenty-Second Amendment generally restricts the president to two terms, there is no such limitation on the office of vice president, meaning an eligible person could hold the office as long as voters continued to vote for electors who in turn would reelect the person to the office; one could even serve under different presidents. This has happened twice: George Clinton (1805–1812) served under both Thomas Jefferson and James Madison; and John C. Calhoun (1825–1832) served under John Quincy Adams and Andrew Jackson. Additionally, neither the Constitution's eligibility provisions nor the Twenty-second Amendment's presidential term limit explicitly disqualify a twice-elected president from serving as vice president. As of the 2016 election cycle however, no former president has tested the amendment's legal restrictions or meaning by running for the vice presidency.