Deputy Secretary of State William Burns (second from R) and Deputy Secretary of State for Management and Resources Thomas Nides (R) testify during the House Foreign Affairs Committee on the September 11th attack in Benghazi against the U.S. consulate, on Capitol Hill, December 20, 2012 in Washington, DC. Secretary of State Hillary Clinton was scheduled to testify, but was unable to attend due to an illness. (Photo by Drew Angerer/Getty Images)

Sen. James Risch (R-ID) (L) and Sen. Bob Corker (R-IN) listen to testimony during the Senate Foreign Relations Committee hearing on the September 11th attacks on the U.S. Consulate in Benghazi, on Capitol Hill, December 20, 2012 in Washington, DC.  (Photo by Drew Angerer/Getty Images)

Congressional staffers listen as Deputy Secretary of State William Burn testifies during the House Foreign Affairs Committee on the September 11th attack in Benghazi against the U.S. consulate, on Capitol Hill, December 20, 2012 in Washington, DC. (Drew Angerer/Getty Images)

A photographer rests his eyes as Committee Chairman Sen. John Kerry (D-MA) (L) gives his opening remarks during the Senate Foreign Relations Committee hearing on the September 11th attacks on the U.S. Consulate in Benghazi, on Capitol Hill, December 20, 2012 in Washington, DC.  (Photo by Drew Angerer/Getty Images)