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.
United States presidential transition
The Presidential Transition Act of 1963 , as amended (by the Presidential Transitions Effectiveness Act of 1998 , Presidential Transition Act of 2000 , and Presidential Transitions Improvements Act of 2015 ), established formal mechanisms to facilitate presidential transitions. Specifically, the act directs the Administrator of General Services to provide facilities, funding of approximately five million dollars, access to government services, and support for a transition team, and to provide training and orientation of new government personnel and other procedures to ensure an orderly transition.