Rep. Jerry Nadler (D-N.Y.) on Tuesday ripped a GOP-crafted memo accusing FBI officials of political bias, calling it misleading and damaging to the Justice Department.

Nadler, the ranking Democrat on the House Judiciary Committee, accused Rep. Devin Nunes (R-Calif.) of using classified material to compile a “conspiracy theory” memo that argues there is political bias within the FBI.

“Too many of our colleagues appear to be constructing their own version of history—completely unrelated to the facts as you and I understand them—based, at least in part, on this memorandum,” Nadler wrote in a letter to Judiciary Chairman Bob Goodlatte (R-Va.).

The content of Nadler’s letter was first reported by Politico.

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Nadler said he reviewed the source material for the memo from Nunes, the chairman of the House Intelligence Committee, saying it tells “a very different story” than what Nunes is suggesting.

The classified documents are said to contain allegations that senior FBI officials abused a surveillance program to target the Trump campaign last year.

Several Republican lawmakers have since called for the classified report to be released, saying it will show that special counsel Robert Mueller’s investigation into possible collusion between Trump campaign officials and Russia is based on politically motivated actions.

Nadler asked Goodlatte in his role as Judiciary Committee chairman to request that the Justice Department make the source material available to the entire Judiciary Committee.

He also called on Nunes to provide the Justice Department and FBI with his memo, calling it “profoundly unfair” that he has not done so already.

“Some of our colleagues have compounded the problem by attacking the Department in public—where, because of the classified and sensitive nature of the case, Department officials cannot defend themselves,” Nadler wrote.

Several Republican lawmakers have in recent weeks accused the FBI of political bias against President Trump, and Trump himself has attacked bureau officials.