David Petraeus and Paula Broadwell in Afghanistan

Paula Broadwell, author of the David Petraeus biography "All In," poses for photos in Charlotte, N.C.

Paula Broadwell, author of the David Petraeus biography "All In," poses for photos in Charlotte, N.C.

Commander of the International Security Assistance Force (ISAF)/U.S. Forces in Afghanistan General David Petraeus shakes hands with author Paula Broadwell in this ISAF handout photo originally posted on July 13, 2011. The FBI investigation that led to the discovery of CIA Director Petraeus' affair with Broadwell was sparked by "suspicious emails" from her to another woman and Petraeus was not the target of the probe, U.S. law enforcement and security officials told Reuters on November 10, 2012.

Paula Broadwell, author of the David Petraeus biography <i>All In</i>, poses for photos in Charlotte, N.C. Petraeus, the retired four-star general renowned for taking charge of the military campaigns in Iraq and then Afghanistan, abruptly resigned Friday, Nov. 9, 2012 as director of the CIA, admitting to an extramarital affair

In this June 23, 2011, file photo, Gen. David Petraeus, center, walks with his wife Holly, left, past a seated Paula Broadwell, rear right, as he arrives to appear before the Senate Intelligence Committee during a hearing on his nomination to be Director of the Central Intelligence Agency on Capitol Hill in Washington.

Hardly Equilateral: General David Petraeus arrives at his Senate CIA confirmation hearing in June 2011 behind his wife, Holly, as his biographer and paramour, Paula Broadwell, second from the left, looks on.

This July 13, 2011, file photo, provided by the International Security Assistance Force's Flickr website shows the former Commander of International Security Assistance Force and U.S. Forces-Afghanistan Gen. Davis Petraeus, left, shaking hands with Paula Broadwell, co-author of his biography "All In: The Education of General David Petraeus."