Former acting Attorney General Sally Yates, who was fired by President Trump over her refusal to enforce his travel ban, called Trump’s demands for an investigation into whether the FBI spied on his campaign “truly unprecedented.”

“You know, this has really taken the assault on the rule of law to a new level,” Yates told “The Axe Files” in response to Trump’s recent tweets.

A week ago Trump demanded an investigation into whether the FBI or Department of Justice “infiltrated or surveilled” his 2016 president campaign for political purposes and whether any such orders were made by Obama administration officials. Dubbing the controversy “spygate,” Trump said it has the potential to be one of the biggest political scandals in history.

Yates said such a demand is beyond dangerous because there should be a divide between the White House and the Justice Department. “He didn’t just opine, he actually directed, and that does take things to a different and more dangerous level,” she said. “Here, it’s even a step beyond a dangerous point because it’s not just directing a criminal investigation … It directly relates to his campaign. That’s truly unprecedented.”

After Trump raised the alarm, Deputy Attorney General Rod Rosenstein asked the DOJ inspector general to review possible Trump campaign infiltration.

Trump has accused the FBI of embedding a spy in his campaign after several news outlets reported that the bureau had a confidential source in contact with three Trump associates during the election. Media reports have indicated the source was former University of Cambridge professor Stefan Halper.

Last week, DOJ and intelligence officials held briefings for top lawmakers on both sides of the aisle to discuss the informant.