Nearly a year after the attack on the U.S. embassy in Benghazi, CNN’s Erin Burnett looks back at the night that took the lives of four Americans including Ambassador Chris Stevens. With special reports from CNN senior international correspondent Arwa Damon and chief national correspondent John King, Burnett revisits the night of the attack, the U.S. military response, the latest on the investigation, and the political firestorm in Washington D.C.