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US Secretary of State Hillary Clinton testifies before the Senate Foreign Relations Committee on the September 11, 2012 attack on the US mission in Benghazi, Libya in the Hart Senate Office Building on January 23, 2013 on Capitol Hill in Washington, DC.  Clinton warned of the challenges posed by rising militancy after the Arab Spring as she appeared before US lawmakers Wednesday to be grilled about a deadly attack. "Benghazi didn't happen in a vacuum," Clinton said at the start of a Senate hearing into the September 11 assault on a US mission in eastern Libya. "The Arab revolutions have scrambled power dynamics and shattered security forces across the region."   AFP PHOTO/Mandel NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US Secretary of State Hillary Clinton testifies before the Senate Foreign Relations Committee on the September 11, 2012 attack on the US mission in Benghazi, Libya in the Hart Senate Office Building on January 23, 2013 on Capitol Hill in Washington, DC.  Clinton warned of the challenges posed by rising militancy after the Arab Spring as she appeared before US lawmakers Wednesday to be grilled about a deadly attack. "Benghazi didn't happen in a vacuum," Clinton said at the start of a Senate hearing into the September 11 assault on a US mission in eastern Libya. "The Arab revolutions have scrambled power dynamics and shattered security forces across the region."   AFP PHOTO/Mandel NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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Clinton tears up at Benghazi hearing

Secretary of State Hillary Clinton becomes emotional as she talks about the Americans lost in the Benghazi attack.

Clinton tears up at Benghazi hearing

Secretary of State Hillary Clinton becomes emotional as she talks about the Americans lost in the Benghazi attack.