The chairman of the House Intelligence Committee is threatening to hold the Justice Department and FBI in contempt of Congress for withholding details about why a top FBI investigator was removed from Special Counsel Robert Mueller’s investigation into Russian interference in the presidential campaign.

“I have instructed House Intelligence Committee staff to begin drawing up a contempt of Congress resolution for DOJ Deputy Attorney General Rod Rosenstein and FBI Director Christopher Wray,” California Rep. Devin Nunes, the Republican chair of the committee, said in a statement on Saturday night.

Nunes set a Monday deadline for the DOJ and FBI to comply with the committee’s list of demands, which includes requests for interviews with Rosenstein, Wray, and deputy FBI director Andrew McCabe as well as documents related to the anti-Trump dossier written by former British spy Christopher Steele.

Committee Republicans have tried in vain for months to force the DOJ and FBI to provide details of the Russia investigation, including how much it relied on the uncorroborated dossier to form the basis of its probe.

But the final straw for Nunes appears to be the bombshell revelation that FBI counterintelligence official Peter Strzok was kicked off of Mueller’s team over the summer after it was discovered that he exchanged anti-Trump text messages with his mistress, an FBI lawyer named Lisa Page who also worked on Mueller’s team. (RELATED: FBI Investigator Who Oversaw Trump, Clinton Investigations Sent Anti-Trump Text Messages)

The New York Times and Washington Post reported on Saturday that the Department of Justice’s inspector general discovered the text messages as part of an investigation into how the FBI handled the Clinton email investigation.

Strzok was removed from the Mueller team in August, though Mueller’s office, the FBI, and the DOJ have left the circumstances of his ouster a mystery for nearly four months. Strzok now works in the FBI’s human resources department.

Nunes pulled no punches in his statement, accusing the FBI and DOJ of “hiding” information about Strzok’s “documented political bias.”

“In light of today’s press reports, we now know why Strzok was dismissed, why the FBI and DOJ refused to provide us this explanation, and at least one reason why they previously refused to make Deputy [FBI] Director [Andrew] McCabe available to the Committee for an interview,” said Nunes.

WATCH US INTELLIGENCE OFFICIALS DISCUSS TRUMP-RUSSIA CONNECTIONS: