Barack Obama

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FILE - In this Jan. 11, 2013 file photo, President Barack Obama shakes hands with Afghan President Hamid Karzai at the conclusion of their joint news conference in the East Room of the White House in Washington. If President Barack Obama decided to leave no military advisory force in Afghanistan next year, would Afghan security unravel to the point of enabling a civil war, a Taliban takeover and a return of al-Qaida in such numbers as to pose a 9/11-type threat. (AP Photo/Pablo Martinez Monsivais, File)