Update at 3:30 p.m. ET. Clinton Testifies Before House Committee:
One of the defining moments of Hillary Clinton's tenure as secretary of state was her strong advocacy for U.S. military intervention that helped oust Libyan dictator Moammar Gadhafi in 2011.
But as she prepared to step down from the post, she faced a grilling from Republicans in both the House and the Senate over what went wrong in Benghazi, Libya, on Sept. 11, 2012, when four Americans were killed, including Ambassador Chris Stevens.