United States Central Intelligence Agency

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John O. Brennan (center) arrives to testify before the Senate Select Committee on Intelligence at a hearing on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on his nomination to head the Central Intelligence Agency. (Andrew Harnik/The Washington Times)

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Sen. Mark R. Warner (left), Virginia Democrat, arrives to offer introductory remarks for John O. Brennan before the Senate Select Committee on Intelligence at a hearing on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on Mr. Brennan's nomination to head the Central Intelligence Agency. (Andrew Harnik/The Washington Times)

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An anti-war protester is removed as John O. Brennan testifies before the Senate Select Committee on Intelligence at a hearing on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on his nomination to head the Central Intelligence Agency. (Andrew Harnik/The Washington Times)

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John O. Brennan returns to a room emptied of spectators to continue his opening remarks, which were interrupted by anti-war protesters as he testified before the Senate Select Committee on Intelligence at a hearing on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on his nomination to head the Central Intelligence Agency. (Andrew Harnik/The Washington Times)

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John O. Brennan testifies before the Senate Select Committee on Intelligence at a hearing on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on his nomination to head the Central Intelligence Agency. (Andrew Harnik/The Washington Times)

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John O. Brennan testifies before the Senate Select Committee on Intelligence at a hearing on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on his nomination to head the Central Intelligence Agency. (Andrew Harnik/The Washington Times)

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Anti-war protesters yell and hold signs as John O. Brennan arrives to testify in front of the United States Senate Select Committee on Intelligence at a hearing on his nomination to be Director of the Central Intelligence Agency on Capitol Hill, Washington, D.C., Thursday, February 7, 2013. (Andrew Harnik/The Washington Times)

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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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Jessica Chastain earned an Oscar nomination for best actress for her portrayal of a young, obsessed CIA operative driving the search for Osama bin Laden in Columbia Pictures' new thriller "Zero Dark Thirty." (Columbia Pictures)

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Outgoing Defense Secretary Leon E. Panetta (center) greets acting CIA Director Michael J. Morell after attending a news conference at the White House on Monday, at which President Obama announced that he is nominating his deputy national security adviser for homeland security and counterterrorism and John O. Brennan (left) as the CIA chief. (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)