Director of the Central Intelligence Agency (CIA) John Brennan pauses while speaking to the press at CIA Headquarters in Virginia, December 11, 2014. Brennan said on Thursday that some agency officers used "abhorrent" interrogation techniques and said it was "unknowable" whether so-called enhanced interrogation techniques managed to get useful intelligence out of terrorism suspects. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS MILITARY HEADSHOT)