CIA director John Brennan held a rare press conference on Thursday . But he said it is `` unknowable '' what information could specifically be attributed to those techniques . The agency has been under fire for its use of drones to kill suspected terrorists in countries such as Pakistan and Yemen. Brennan described the atmosphere in the agency that led to enhanced interrogation techniques .
CIA director John Brennan held a rare press conference on Thursday . The agency has been under fire for its use of drones to kill suspected terrorists in countries such as Pakistan and Yemen. Brennan described the atmosphere in the agency that led to enhanced interrogation techniques .