Drone strikes are employed only as a "last resort," Brennan told the committee. But he also said he had no qualms about going after U.S.-born cleric Anwar al-Awlaki in September 2011. A drone strike in Yemen killed al-Awlaki and Samir Khan, both U.S. citizens. A drone strike two weeks later killed al-Awlaki's 16-year-old son, a Denver native.
Brennan spent 25 years at the CIA before moving in 2003 from his job as deputy executive director of the agency to run the Terrorist Threat Integration Center. He later worked as interim director of the center's successor organization, the National Counterterrorism Center.
When Bush's second term began in 2005, Brennan left government to work for a company that provides counterterror analysis to federal agencies. After Obama took office in 2009, he returned to the federal payroll as the president's top counterterrorism adviser in the White House.
If confirmed by the full Senate, Brennan would replace Michael Morell, the CIA's deputy director who has been acting director since David Petraeus resigned in November after acknowledging an affair with his biographer.
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