Twenty-second Amendment to the United States Constitution
Since coming into force in 1951, the amendment has applied to six presidents who have been elected twice: Dwight D. Eisenhower, Richard Nixon, Ronald Reagan, Bill Clinton, George W. Bush, and Barack Obama. It has also applied to two who entered office intra-term due to their predecessor's death or resignation: Lyndon B. Johnson and Gerald Ford. Johnson became president in November 1963, following the assassination of John F. Kennedy, served out the final of Kennedy's term, and was elected to a full four-year term in 1964. Four years later, he briefly ran for a second full term, but withdrew from the race during the party primaries. Had Johnson served a second full term – through January 20, 1973 – the total length of his presidency would have been ; as it happened, Johnson died two days after this date. Gerald Ford, who became president in August 1974 following the resignation of Richard Nixon, served the final of Nixon's term, and attempted to win a full four-year term in 1976, but was defeated by Jimmy Carter. Johnson was eligible to be elected to two full terms in his own right, as he had served less than two years of Kennedy's unexpired term, whereas Ford was eligible to be elected to only one full term, as he had served more than two years of Nixon's unexpired term.
Donald Trump 2016 presidential campaign
In 2013, Trump researched a possible run for President of the United States in 2016. In October 2013, some New York Republicans, including Joseph Borelli and Carl Paladino who later served as New York State Co-Chairmen for the presidential campaign, suggested Trump should instead run for governor of the state in 2014. In February 2015, Trump did not renew his television contract for "The Apprentice", which raised speculation of his candidacy for President of the United States in 2016. Later that year, Trump was a featured speaker at the Conservative Political Action Conference.