DOJ warns House Intel chairman about purported secret memo on FBI

Furthermore, the department said certain allegations of impropriety are completely unfounded.

Last week, Nunes disclosed that his staff had drafted the memo, which was deemed classified but shared with other House members. It's not clear what the memorandum states or what information is contained within it, but the Justice Department letters suggests the Nunes memorandum ties alleged government surveillance of Trump associates to information first provided by the author of the infamous "dossier" alleging collusion between Trump aides and Russian operatives.

In the letter sent to Nunes today, Assistant Attorney General Stephen Boyd noted recent media reports allege "abuses at the Department of Justice and the Federal Bureau of Investigation in the FISA process."

"Though we are currently unaware of any wrongdoing related to the FISA process, we agree that any abuse of that system cannot be tolerated," Boyd wrote.

The announcement of the Nunes memorandum has been followed by an online effort to reveal the memo publicly, pushed around the world with the hashtag #ReleaseTheMemo, according to multiple data analysis firms.

It "may help carry White House water, but it is a deep disservice to our law enforcement professionals,” Schiff said.

Nadler called on Nunes to make his memorandum available to the Justice Department.

--ABC News' Justin Fishel contributed to this report.