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).
Twentieth Amendment to the United States Constitution
of the Constitution states that Congress must meet at least once per year, on the first Monday in December, though Congress could by law set another date and the president could summon special sessions. The original text of the Constitution set a duration for the terms of federal elected officials, but not the specific dates on which those terms would begin or end.