Former CIA director and retired Gen. David Petraeus during his address Tuesday at the University of Southern California. Frederic J. Brown /AFP/Getty Images hide caption

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The nominees: John Brennan (left), who is President Obama's choice to head the CIA; and former Sen. Chuck Hagel, R-Neb., who the president has asked to be secretary of defense. STAFF/Reuters /Landov hide caption

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John Brennan, who President Obama wants to lead the CIA. Alex Wong/Getty Images hide caption

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Then-CIA Director David Petraeus testifies on worldwide threats before the Senate Select Committee on Intelligence, on Jan. 31. Zhang Jun/Xinhua /Landov hide caption

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David Petraeus, while he was the top commander of U.S. and coalition forces in Afghanistan, and Paula Broadwell in July 2011. He resigned from his post as CIA director because of an extramarital affair they had. ISAF/Reuters /Landov hide caption

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Former CIA officer John Kiriakou (right), accompanied by his attorney, John Hundley, leaving federal court in Alexandria, Va., last January. Jacquelyn Martin/AP hide caption

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April 13: In Karachi, activists from the Shabab-e-Milli group set fire to U.S. flags during a protest against the reopening of the NATO supply route to Afghanistan. Asif Hassan /AFP/Getty Images hide caption

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