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, during a hearing on Capitol Hill in Washington, DC, on January 23, 2013. Secy. 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. AFP PHOTO / Saul LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)