Gen. David Petraeus Gen. David Petraeus

Former CIA director David Petraeus leaves the federal courthouse in Charlotte, N.C., in April after pleading guilty to sharing top government secrets with his biographer. Chuck Burton/AP hide caption

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Chuck Burton/AP

David Petraeus speaks in Los Angeles on Nov. 7, 2014. The former head of the U.S.-led coalition in Iraq tells The Washington Post that Iran and Shiite-backed militias pose a greater threat to Iraq than the self-described Islamic State. Imeh Akpanudosen/Getty Images hide caption

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Imeh Akpanudosen/Getty Images

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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Zhang Jun/Xinhua /Landov

Gen. David Petraeus in Kandahar, Afghanistan, on July 4, 2011. U.S. Navy Lt. j.g. Haraz N. Ghanbari/Getty Images hide caption

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U.S. Navy Lt. j.g. Haraz N. Ghanbari/Getty Images