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 on Monday tweeted quotes from George Washington University law professor Jonathan Turley’s appearance on “Fox & Friends” to bolster his claims of surveillance on his presidential campaign.

Trump also quoted Turley, a constitutional law professor and contributor to The Hill, to slam 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, whom Trump fired last year.

“We now find out that the Obama Administration put the opposing campaigns presidential candidate, or his campaign, under investigation. That raises legitimate questions. I just find this really odd...this goes to the heart of our electoral system.” Jonathan Turley on @FoxNews — Donald J. Trump (@realDonaldTrump) May 28, 2018

“Sally Yates is part of concerns people have raised about bias in the Justice Dept. I find her actions to be really quite unbelievable.” Jonathan Turley — Donald J. Trump (@realDonaldTrump) May 28, 2018

“I think the president has raised a legitimate issue. I don’t agree with how he did it but to say that we shouldn’t investigate this matter is rather bizarre,” Turley said on the Fox News show prior to the president's tweets.

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“We now find out that the Obama administration put the opposing campaign’s presidential candidate, or his campaign, under investigation,” he continued. “That raises legitimate questions.”

Turley also criticized Yates for her decision to not defend the first iteration of Trump’s travel ban on refugees from several majority-Muslim countries. The president fired her over the decision when she was serving as acting attorney general.

The law professor was responding to Yates saying that Trump has “taken the assault on the rule of law to a new level.”

“I’m afraid that it’s a rather ironic statement because she is part of the concerns people have raised about bias in the Justice Department,” Turley said.

“She told an entire department to stand down and not to defend the president’s first immigration order,” he said. “I said at the time that she was fired for good cause, I still believe that. I find her actions to be really quite unbelievable.”

Trump has repeatedly claimed that the FBI spied on his campaign during the 2016 election.

Media reports state that an FBI informant met with at least three Trump campaign advisers in 2016.