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 ChaffetzJason ChaffetzHouse Oversight slams TSA after report says officials 'interfered' in disciplinary case Gowdy steps down from Ethics Committee, citing 'challenging workload' Criminal referrals by members of Congress raise procedural questions MORE (R-Utah) and Sen. Lindsey GrahamLindsey Olin GrahamDHS chief takes heat over Trump furor Overnight Defense: GOP chair blames Dems for defense budget holdup | FDA, Pentagon to speed approval of battlefield drugs | Mattis calls North Korea situation 'sobering' Bipartisan group to introduce DACA bill in House 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 McCainJohn Sidney McCainMcCain rips Trump for attacks on press NSA spying program overcomes key Senate hurdle Meghan McCain says her father regrets opposition to MLK Day MORE (Ariz.), Kelly AyotteKelly Ann AyotteLessons from Alabama: GOP, throw out the old playbook The Hill's 12:30 Report Explaining Democratic victories: It’s gun violence, stupid MORE (N.H.), Ron JohnsonRonald (Ron) Harold JohnsonGOP senators eager for Romney to join them The House needs to help patients from being victimized by antiquated technology Comey’s original Clinton memo released, cites possible violations MORE (Wis.) and Reps. Darrell Issa (Calif.), Trey GowdyHarold (Trey) Watson GowdyHouse Oversight slams TSA after report says officials 'interfered' in disciplinary case Gowdy steps down from Ethics Committee, citing 'challenging workload' Oversight Dems ask for subpoena of Trump Organization 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.