Answer:

vetoed

Answer	Crossword Clue
VETOED	Killed in the Oval Office
VETOED	Nixed
VETOED	Put the kibosh on

VETOED	Killed, in a way
VETOED	Shot down
VETOED	Turned thumbs down on
VETOED	Exercised a presidential power
VETOED	Acted presidential?
VETOED	Killed, as a bill
VETOED	Voted against.
VETOED	Ruled out

VETOED	Prohibited
VETOED	Rejected
VETOED	Turned down
VETOED	Nixed at the Security Council
VETOED	Said no to
VETOED	Nixed by Nixon, e.g.
VETOED	Like pocketed bills
VETOED	Interdicted