If I understand correctly, the United States' process of presidential nominations and appointments to positions which require the Senate's confirmation (advice and consent) is as follows:
- The president makes a nomination (specifying the nominee and the position) and sends it to the Senate.
- The Senate then votes whether to confirm the nominee or not (whether to "advise and consent" to such nomination/appointment).
- Only after the Senate votes to confirm the nominee, the president may officially appoint him/her.
There is thus some time between the confirmation by the Senate and the final appointment by the president. Now suppose that during it, some serious information about the nominee comes to light which would make him/her unacceptable.
- Can the Senate vote to withdraw or revoke its confirmation of the nominee (so that the president could not appoint the nominee unless nominated and confirmed again)?
- Can the president withdraw or revoke the nomination (to officially ensure that the nominee could not be appointed unless nominated and confirmed again), even if the Senate has already voted to confirm it?