Twenty-second Amendment to the United States Constitution
Some argue that the 22nd Amendment and 12th Amendment bar any two-term president from later serving as vice president as well as from succeeding to the presidency from any point in the presidential line of succession. Others contend that the original intent of the 12th Amendment concerns qualification for "service" (age, residence, and citizenship), while the 22nd Amendment, concerns qualifications for "election", and thus (strictly applying the text) a former two-term president is still eligible to "serve" as vice president (neither amendment restricts the number of times an individual can be elected to the vice presidency), and then succeed to the presidency to serve out the balance of the term (though prohibited from running for election to an additional term).
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.