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Then U.S. Senator Barack Obama listens (L) as Gen. David Petraeus (R) discusses security improvements in Baghdad while giving him an aerial tour of the city, in this July 21, 2008 file photo. U.S. President Obama has chosen Petraeus to replace Gen. Stanley McChrystal as the top U.S. general in Afghanistan, the president announced on June 23, 2010. Picture taken July 21, 2008. REUTERS/Lorie Jewell/Multi-National Forces Iraq Public Affairs/Handout

David Petraeus

David Petraeus apologized on March 26 to an audience of veterans for the conduct that led to his resignation in 2012 as head of the CIA following the disclosure of an extramarital affair with his biographer, Paula Broadwell.