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President Donald Trump lashed out at U.S. District Judge Beryl Howell, an Obama appointee hearing a lawsuit over an executive order against law firm Perkins Coie.

In a Wednesday message posted on his Truth Social platform, Trump called Howell an "unmitigated train wreck" after she declined to remove herself from the case.

"I’m suing the law firm of Perkins Coie for their egregious and unlawful acts, in particular the conduct of a specific member of this firm, only to find out that the Judge assigned to this case is Beryl Howell, an Obama appointment, and a highly biased and unfair disaster," Trump wrote. "She ruled against me in the past, in a shocking display of sick judicial temperament, on a case that ended up working out very well for me, on appeal."

Trump is thought to be upset with Perkins Coie after it hired Fusion GPS, which funded an investigation into him in 2016 and paid for the so-called Steele dossier on behalf of Hillary Clinton's campaign.

"I could have a 100% perfect case and she would angrily rule against me," the president whined. "It’s called Trump Derangement Syndrome, and she’s got a bad case of it. To put it nicely, Beryl Howell is an unmitigated train wreck. NO JUSTICE!!!"

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For her part, Howell has accused Trump and the Department of Justice of trying to undermine the court.

“This strategy is designed to impugn the integrity of the federal judicial system and blame any loss on the decision-maker rather than fallacies in the substantive legal arguments presented," she wrote in one ruling against Trump's executive order.

“Adjudicating whether an Executive Branch exercise of power is legal, or not, is actually the job of the federal courts, and not of the President or the Department of Justice, though vigorous and rigorous defense of executive actions is both expected and helpful to the courts in resolving legal issues."