Republican lawmakers left a closed-door briefing with Secretary of State Hillary Clinton and other officials on Thursday still unconvinced by the administration’s assessment that last week’s attack that killed four Americans in Libya wasn’t a premeditated act of terrorism.

“They’re trying to cover their behinds,” Rep. Bill Flores (R-Texas) told The Hill upon leaving the House briefing with Clinton, Director of National Intelligence James Clapper and Deputy Secretary of Defense Ashton Carter. Asked if they were successful, he said: “No.”