A Marine operations commander told lawmakers Wednesday he gave troops in Libya permission to respond to a September 2012 attack on a U.S. mission in Tripoli. Testifying in closed session before the House Armed Services Committee, Col. George Bristol contradicted claims by some congressional Republicans he had issued a stand-down order following the attack, in which U.S. Ambassador to Libya J. Christopher Stephens and three other Americans were killed, The Hill reported. Bristol, who commanded Joint Special Operations Task Force-Trans Sahara at the time of the attack, said he gave the Tripoli security team leader, Lt. Col. S.E. Gibson, permission...