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.
Rob Portman
In March 2014, Larry Sabato of the University of Virginia Center for Politics speculated that Portman might run for president in 2016. Sabato forecasted: "[Portman] might have an edge in 2016. Americans tire of their incumbent presidents, and often choose a very different successor with dissimilar characteristics. Portman is all steak and no sizzle." In October 2014, students from the College of William and Mary formed the Draft Rob Portman PAC to encourage Portman to run for president in 2016. However, Portman announced in December 2014 that he would not run for president and would instead seek a second term in the United States Senate.
Portman and Senator Ben Cardin (D-Maryland) proposed the Israel Anti-Boycott Act in late 2018 which would make it illegal for companies to engage in boycotts against Israel. Cardin and Portman have been strongly in promotion of the bill, working to integrate it into larger spending legislation to be signed by President Trump.