Sen. John F. Kerry, Massachusetts Democrat, who is chairman of the Senate Foreign Relations Committee, leads a hearing on the attack on the U.S. Consulate in Benghazi, Libya, where the ambassador and three other Americans were killed Sept. 11, on Capitol Hill in Washington on Thursday, Dec. 20, 2012. Sen. Richard G. Lugar (left), Indiana Republican, is the ranking GOP member on the panel.  (AP Photo/J. Scott Applewhite)

Photo by: J. Scott Applewhite

Sen. John F. Kerry, Massachusetts Democrat, who is chairman of the Senate Foreign Relations Committee, leads a hearing on the attack on the U.S. Consulate in Benghazi, Libya, where the ambassador and three other Americans were killed Sept. 11, on Capitol Hill in Washington on Thursday, Dec. 20, 2012. Sen. Richard G. Lugar (left), Indiana Republican, is the ranking GOP member on the panel. (AP Photo/J. Scott Applewhite)