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The consulate was attacked on Sept. 11, 2012, in an assault by a militant group that claimed the lives of U.S. Ambassador to Libya Christopher Stevens and three other Americans. Republicans have criticized the administration for not doing enough to prevent the deaths.

“As the truth about what happened in Benghazi on the night of September 11 continues to trickle out, it’s becoming more apparent that the administration’s lack of truthfulness seems to emanate from a desire to hide something from the American people,” the senators said.

Last week, Senate Intelligence Committee Chairwoman Dianne FeinsteinDianne Emiel FeinsteinFive things to know about the elephant trophies controversy The feds need to be held accountable for role in Russia scandal Lawyer: Kushner is 'the hero' in campaign emails regarding Russia MORE (D-Calif.) announced that she would hold a hearing on the attack in Benghazi. The House has already started an investigation.

Earlier this month, Secretary of State Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE said she'd take responsibility for the lack of security during the attack in order "to avoid some kind of political gotcha" for the administration. 

In an interview with MSNBC aired on Monday, Obama vowed that he would find the people responsible and urged lawmakers to allow the administration to conduct a full probe into the attack, acknowledging that as commander in chief, he was “ultimately” responsible for the security of U.S. diplomats.