Reps Adam Smith, the top Democrat on the House Armed Services Committee, and Elijah Cummings, the top Democrat on the House Oversight and Government Reform Committee, said the multiple inquires and reports have answered the questions surrounding the September 11, 2012, assault.
Four Americans, including US Ambassador Chris Stevens, were killed.
Republicans have accused the Obama administration of trying to mislead the American people about an act of terrorism in the final weeks before the November presidential election.
Cummings and Smith spoke shortly before the House committees planned to interview retired Army Gen Carter Ham, who headed US Africa Command on the night of the attack.
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Cummings said Ham has been interviewed at least six times, and that an independent report and a Republican report from the House Armed Services Committee found no evidence of a "stand down" order to the military, delaying a response.
Multiple independent and congressional investigations have largely faulted the State Department for inadequate security at the mission.