WASHINGTON (AP) — CIA officers revealed a clash over how quickly they should go help the besieged U.S. ambassador during the 2012 attack on an outpost in Libya, and a standing order for them to avoid violent encounters, according to a congressman and others who heard their private congressional testimony or were briefed on it.

The Obama administration has been dogged by complaints that the White House, Pentagon and State Department may not have done enough before and during the attack to save U.S. Ambassador Chris Stevens and three others, and by accusations that it later engaged in a cover-up.