In the United States, a recess appointment is an appointment by the President of a federal official, who would normally require Senate confirmation, if it is made “during the recess of the U.S. Senate”. To remain in effect, a recess appointment must be approved by the Senate by the end of the next session of Congress, or the position becomes vacant again; in current practice this means that a recess appointment must be approved by roughly the end of the next calendar year.
The Constitutional basis of recess appointments is Article II, Section 2, Clause 3 of the U.S. Constitution, which provides:
The President shall have Power to fill up all Vacancies that may happen during the Recess of the Senate, by granting Commissions which shall expire at the End of their next Session.
The Senate or House may seek to block potential recess appointments by not allowing the Senate to adjourn under Article 1, Section 5, Clause 4 of the Constitution, which provides that both Houses must consent to an adjournment. This tactic is especially used when either House of Congress is controlled by a different party than that of the President, the Senate or House may seek to block potential recess appointments by not allowing the Senate to adjourn for more than three days, blocking a longer adjournment that would allow recess appointments to be made.
According to Henry B. Hogue, of the Congressional Research Service's Government and Finance Division:
Recent Presidents have made both intersession (between sessions or Congresses) and intrasession (during a recess within a session) recess appointments. Intrasession recess appointments were unusual, however, prior to the 1940s. Intrasession recess appointments have sometimes provoked controversy in the Senate, and there is also an academic literature that has drawn their legitimacy into question.
It has been argued that as the clause was originally understood, it was expected that if the Senate was in session when an office became vacant, the president would make a standard advice-and-consent appointment at that time. In Federalist No. 67, Alexander Hamilton wrote: