President Trump doubled down on his call for the Justice Department to investigate Democrats on Friday after a former Democratic National Committee (DNC) chair acknowledged the party tipped the scales in Hilary Clinton's favor during last year's primary.

Trump told reporters outside the White House that he is “disappointed” in the Justice Department for not investigating Clinton, reiterating that he believes the agency should do something.

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“I’m really not involved with the Justice Department. I’d like to let it run itself, but honestly, they should be looking at the Democrats," he said.

“They should be looking at Podesta and all of that dishonesty, they should be looking at a lot of things, and a lot of people are disappointed in the Justice Department, including me,” he said, referencing John Podesta, former chair of Clinton's campaign.

In an excerpt of her new book, former DNC Chairwoman Donna Brazile wrote about a deal between Clinton’s 2016 campaign and the DNC aimed at keeping the party financially viable.

The deal wasn't illegal, Brazile wrote, but it "sure looked unethical." The former DNC chair said it “broke [her] heart” to find “proof” that the primary between Clinton and Sen. Bernie Sanders Bernard (Bernie) SandersSenate Dems seek to turn tables on GOP in climate change fight Bernie Sanders Town Hall finishes third in cable news race, draws 1.4 million viewers Woman to undecided Biden: 'Just say yes' to 2020 bid MORE (I-Vt.) was rigged.

Trump has tweeted several times about the Democratic deal since an excerpt of Brazile’s book was published by Politico on Thursday, calling it “illegal” and bringing back his nickname for Clinton, “Crooked Hillary.”