The vote was held one day after Republican Sen. Rand Paul’s nearly 13-hour filibuster seeking to block Brennan’s nomination. Paul challenged Brennan’s bid over the Obama administration’s refusal to rule out drone strikes on U.S. soil. On Thursday, Paul received a new letter from Attorney General Eric Holder clarifying the administration’s stance. Holder wrote: "'Does the President have the authority to use a weaponized drone to kill an American not engaged in combat on American soil?' The answer to that question is no." Paul says he is satisfied with the answer.