Republican lawmakers are pressing James Comey, the new FBI director, to step up the bureau’s investigation of the deadly 2012 attack on the U.S. mission in Benghazi, Libya, calling the administration’s efforts “simply unacceptable.”

Rep. Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (R-Utah) and Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans signal openness to working with Biden Loeffler calls for hearing in wake of Netflix's 'Cuties' Quinnipiac poll shows Graham, Harrison tied in South Carolina Senate race MORE (R-S.C.) are spearheading the effort with a draft letter to Comey, demanding the FBI director brief Congress on his work in the next month.

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"It has been more than 10 months since the attacks," the draft letter, first reported by CNN, reads. "We appear to be no closer to knowing who was responsible today than we were in the early weeks following the attack. This is simply unacceptable.

"We encourage you to be aggressive in your investigation to properly hold accountable those who attacked our compounds in Benghazi," the letter adds. "We owe the families of those killed, and the people of this nation, answers to who was responsible and ensure they are held accountable."

The deadly attack claimed the lives of four Americans, including Ambassador Christopher Stevens.

Chaffetz confirmed the letter on Fox News on Wednesday, claiming some of the suspects in the investigations continue to live in Benghazi but the FBI has never talked to them.

Other lawmakers signing the letter include Sens. John McCain John Sidney McCainKelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks Trump pulls into must-win Arizona trailing in polls MORE (Ariz.), Kelly Ayotte Kelly Ann AyotteBottom line Bottom line Bottom Line MORE (N.H.), Ron Johnson Ronald (Ron) Harold JohnsonGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high The Hill's 12:30 Report - Presented by Facebook - Big 10 votes to resume football season GOP votes to authorize subpoenas, depositions in Obama-era probe MORE (Wis.) and Reps. Darrell Issa (Calif.), Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (S.C.) and Jim Jordan (Ohio).

The lawmakers hope to deliver the letter to Comey on Wednesday or Thursday, according to CNN.

The letter comes two days after the Senate confirmed James Comey to lead the FBI on a 93-1 vote.

The FBI faced criticism immediately after the attack when news reports indicated that it did not reach scene to investigate until weeks after the assault.

Republican lawmakers have questioned if the administration could have done more to prevent the attack and responded quickly.

The Obama administration also faced intense criticism for initial talking points that claimed the attack was the result of protests over an anti-Islam video, later acknowledging that it was a planned terrorist operation.