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.
NLRB v. Noel Canning
In "Federalist No. 67," Alexander Hamilton wrote that the appointment power was ordinarily confined jointly to the President and the Senate, but considering it unlikely that the Senate would remain continuously in session, the Constitution allowed the President to make temporary appointments when the Senate is in recess. Since the advent of nearly year-round sessions, the United States Senate no longer has long recesses. That has potentially changed the meaning of the Recess Appointment Clause of the Constitution, which has affected the way the Senate and the President interact.