The chairman of the House Benghazi panel fired back Friday at the Defense Department for criticizing the Republican-led investigation into the deadly 2012 attacks in Benghazi, Libya.

Rep. Trey Gowdy, R-S.C., outlined his objections in a letter to Defense Secretary Ash Carter, telling the Pentagon chief that his top assistant for legislative affairs had in recent correspondence intentionally mischaracterized the inquiry.

“It is also riddled with factual inaccuracies, which not only does a disservice to the public but also does a disservice to the women and men who work for the Department of Defense,” Gowdy wrote.

Four Americans, including U.S. Ambassador Chris Stevens, died during the twin assaults on Sept. 11, 2012. Questions about security at the diplomatic facility have hounded front-running Democratic presidential candidate Hillary Clinton, who was secretary of state at the time.

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