Former Deputy Attorney General Sally Yates Sally Caroline YatesButtigieg, former officials added to Biden's transition team The Hill's 12:30 Report: Delegates stage state-centric videos for the roll call Trump fires back at Yates for convention speech: 'Terrible AG' MORE on Monday said President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE has taken his “assault on the rule of law to a new level” by demanding the Justice Department (DOJ) look into alleged surveillance abuses of his 2016 presidential campaign.

Yates, whom Trump fired last year after she refused to defend his travel ban targeting several Muslim-majority countries, warned that he crossed a new line by asking the department on Twitter over the weekend to investigate whether the FBI surveilled his campaign for "inappropriate purposes.”

“I think what we’re seeing here is the president has taken his all-out assault of the rule of law to a new level and this time he is ordering up an investigation of the investigators who are examining his own campaign. You know, that’s really shocking,” Yates said on MSNBC's "Morning Joe."

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“I know it was just a tweet but he did say something to the effect of, if I recall correctly, ‘I hereby order.’ And we saw the Justice Department respond to that," Yates added. “I think [Deputy Attorney General] Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE is trying to strike a balance here between defusing the situation and also protecting the rule of law and the institutional integrity of the department.”

Yates also cautioned that the Justice Department becoming more accustomed to Trump’s actions and statements could threaten the rule of law.

“We become accustomed to things that the president does, in directing DOJ,” Yates said. “You know, I can remember a time when he would issue a tweet or directive and the reports would be: ‘In an unprecedented act, the president did X or Y.’ It’s not so unprecedented anymore and oftentimes it doesn’t even make it through the full 24-hour news cycle.”

Yates has spoken out against the president's attacks on the Justice Department in the past.

Earlier this month, Yates said Trump was "tearing down the legitimacy” of the agency, warning that his attacks on top officials like Attorney General Jeff Sessions and special counsel Robert Mueller are “not normal,” but are becoming normalized.