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.
2016 United States presidential election
President Barack Obama, a Democrat and former U.S. Senator from Illinois, was ineligible to seek reelection to a third term due to the restrictions of the Twenty-second Amendment; in accordance with Section 1 of the Twentieth Amendment, his term expired at noon eastern standard time on January 20, 2017.