The Senate Intelligence Committee will postpone voting to confirm White House counter-terrorism advisor John Brennan as CIA director.
The vote was scheduled to take place Thursday.
Committee members are requesting the White House provide more information on its drone program before moving forward with the vote.
Last week, Brennan defended the controversial drone program in his confirmation testimony.
Sen. Dianne Feinstein, D-Calif., said the committee needs to see more classified legal opinions justifying use of the deadly drones.
The senators are also demanding more details about the Sept. 11 attack on the U.S. Consulate in Benghazi, Libya last year. Four Americans were killed in the attack, including U.S. Ambassador Chris Stevens.
A vote is now expected to take place later this month.