A group of more than 2,000 family members of victims of the 9/11 terrorist attacks are denouncing the possibility of a plea deal that would allow five prisoners facing charges over the attacks to avoid the death penalty.

The families said in a letter to President Joe Biden this week that "the pain is all worse" after they learned "practically on the eve of the 9/11 anniversary" from the administration about the proposed deal, specifically for Khalid Sheikh Mohammed.

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Mohammed, who has been identified as the "principal architect" of the attacks, is currently imprisoned along with four others at Guantanamo Bay's detention camp in relation to the attacks.

The families warned in their letter a plea deal with the prisoners would suppress critical information about 9/11's orchestration that would normally surface during a trial.

"The pain is all the worse as we learn from the Department of Justice, practically on the eve of the 9/11 anniversary, in a form letter that it is proposing a deal with terrorist Khalid Sheikh Mohammed that will prevent a public trial," they wrote.

They added that a lack of a trial would "continue to keep the information provided to his legal team - information that no doubt would shed light on the identity of the 9/11 conspirators - secret and hidden not only from the 9/11Families but from the American public."

The families had received correspondence from the Pentagon in a letter dated Aug. 1 that its Office of the Chief Prosecutor “has been negotiating and is considering entering into pre-trial agreements” that would allow the five to enter guilty pleas to avoid the death penalty, according to an Associated Press report.

The negotiations, which have been ongoing for more than a year, are a result of concerns that the prisoners had been subjected to torture, including waterboarding, by the CIA and that that could hurt prosecutors' cases against them, as detailed in a New York Times report.

The families wrote to Biden, "You are our President and we ask that you prioritize the interests of the victims of the 9/11Terrorist Attacks over those of Khalid Sheikh Mohammed or other terrorists; that you not bow to the demands of any embarrassed government officials willing to sacrifice transparency in favor of reputation; and that you continue to support us in our search for truth and justice."

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National Security Council spokeswoman Adrienne Watson said in a statement provided to the Washington Examiner that the White House had, as is standard practice, not been consulted on the Office of the Chief Prosecutors's correspondence.

"Consistent with that, and to be totally clear, this letter reflects no policy shift, decision, guidance, or anything else from the White House," Watson said. "We remain deeply committed to justice for victims of terrorism as well as accountability for its perpetrators."