The Department of Justice filed a motion on Monday opposing the release of the affidavit underlying the FBI’s search warrant for former President Donald Trump’s Mar-a-Lago home.

“If disclosed, the affidavit would serve as a roadmap to the government’s ongoing investigation, providing specific details about its direction and likely course, in a manner that is highly likely to compromise future investigative steps,” the DOJ wrote.

“The fact that this investigation implicates highly classified materials further underscores the need to protect the integrity of the investigation and exacerbates the potential for harm if information is disclosed to the public prematurely or improperly.”

The Justice Department told the court that it does not object to unsealing some other documents, including cover sheets associated for the search warrant application and the government’s prior motion to seal.