The seal of the Central Intelligence Agency. The case that prosecutors want journalist James Risen to testify in involves an alleged leak of information by a former CIA agent. Greg E. Mathieson Sr. /MAI/Landov hide caption

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In Moscow's Red Square, people still line up to visit Lenin's tomb. Though the Cold War is over, Russia and the U.S. keep watchful eyes on each other. Tuesday, Russian officials claimed to have uncovered a CIA spy. Sergei Ilnitsky /EPA /Landov hide caption

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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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