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