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Hillary Clinton, former U.S. secretary of state and 2016 Democratic presidential candidate, speaks during a House Select Committee on Benghazi hearing in Washington, D.C., U.S., on Thursday, Oct. 22, 2015. Clinton said that she accepted responsibility for a lethal 2012 attack on the U.S. diplomatic mission in Benghazi, Libya and that she sought afterward to improve security for State Department workers abroad, as the House Benghazi panel investigating the incident began a hearing that may prove a turning point for her presidential campaign. Photographer: Andrew Harrer/Bloomberg via Getty Images

Hillary Clinton, former U.S. secretary of state and 2016 Democratic presidential candidate, speaks during a House Select Committee on Benghazi hearing in Washington, D.C., U.S., on Thursday, Oct. 22, 2015. Clinton said that she accepted responsibility for a lethal 2012 attack on the U.S. diplomatic mission in Benghazi, Libya and that she sought afterward to improve security for State Department workers abroad, as the House Benghazi panel investigating the incident began a hearing that may prove a turning point for her presidential campaign. Photographer: Andrew Harrer/Bloomberg via Getty Images