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.
Twenty-second Amendment to the United States Constitution
The practical applicability of this distinction has not been tested, as no former president has ever sought the vice presidency, although in 1980, former president Gerald Ford was mentioned as a possible vice presidential running mate for Republican presidential nominee Ronald Reagan, and there were some negotiations between the two camps. Nothing ever became of the idea. During Hillary Clinton's 2016 presidential campaign, she jokingly said that she had considered naming her husband Bill Clinton as her vice presidential running mate, but had been advised it would be unconstitutional. Most likely, the constitutional question raised will remain unanswered unless the situation actually occurs.