John Brennan

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**FILE** John Brennan, then-nominee for CIA director, testifies Feb. 7, 2013, on Capitol Hill in Washington during his confirmation hearing before the Senate Intelligence Committee. (Associated Press)

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**FILE** CIA Director nominee John Brennan testifies Feb. 7, 2013, on Capitol Hill in Washington before the Senate Select Intelligence Committee holding his confirmation hearing. (Associated Press)

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** FILE ** Sen. Dianne Feinstein (right), California Democrat and chairman of the Senate Intelligence Committee, meets with CIA Director-nominee John Brennan (left), currently assistant to the president for homeland security and counterterrorism, on Capitol Hill in Washington on Thursday, Jan. 31, 2013. (AP Photo/Pablo Martinez Monsivais)

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**FILE** Homeland Security Adviser John Brennan (right) and White House Chief of Staff Bill Daley accompany President Obama at Andrews Air Force Base, Md., on May 5, 2011, en route to New York City to visit ground zero and meet with first responders and family members of victims of the Sept. 11, 2001, attacks. (Associated Press)

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President Obama and former Nebraska Sen. Chuck Hagel (left), the president's choice for Defense Secretary, listen as White House counterterrorism adviser John Brennan, the president's choice for CIA director, speaks in the East Room of the White House in Washington on Jan. 7, 2013, where the president made the announcement. (Associated Press)

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President Obama (center) announces in the East Room of the White House in Washington on Monday, Jan. 7, 2013, that he is nominating John Brennan (right), his deputy national security adviser for homeland security and counterterrorism, as the new director of the CIA, and former Nebraska Sen. Chuck Hagel (left) as the new defense secretary. (AP Photo/Charles Dharapak)

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**FILE** John Brennan, deputy national security adviser for homeland security and counterterrorism, briefs reporters at the White House in Washington on Oct. 29, 2010. (Associated Press)

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John Brennan, President Obama's chief counterterrorism adviser, speaks with The Associated Press during an interview in the Roosevelt Room at the White House in Washington, Wednesday, Aug. 31, 2011. (AP Photo/J. Scott Applewhite)

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Vice President Joe Biden (center) talks Sept., 6, 2011, with John Brennan (left), President Obama's chief counterterrorism adviser, and CIA director David Petraeus following a swearing-in ceremony in the Roosevelt Room of the White House in Washington. (Associated Press)

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Al-Asiri "has demonstrated real proficiency as far as concealment methods as well as the materials that are used in these" bombs. - John Brennan, President Obama's senior counterterrorism adviser

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** FILE ** In this Sept. 7, 2011, file photo, John Brennan, assistant to the president for Homeland Security and Counterterrorism, speaks in Washington. U.S. bomb experts are picking apart a sophisticated new al Qaeda improvised explosive device, Brennan said Tuesday. (AP Photo/Susan Walsh, File)