President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE lashed out at Sen. Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (D-Calif.) on Wednesday for unilaterally releasing the full transcript an interview between congressional investigators and the founder of the opposition research firm that commissioned a controversial dossier on the president during the 2016 presidential race.

In a tweet, Trump described the top Democrat on the Senate Judiciary Committee as “sneaky” and said her release of the more than 300-pages of interview transcripts between Fusion GPS co-founder Glenn Simpson and Senate Judiciary Committee lawmakers and lawyers might be “illegal.”

The president also called for Feinstein to face a primary challenge in her reelection campaign in 2018.

“The fact that Sneaky Dianne Feinstein, who has on numerous occasions stated that collusion between Trump/Russia has not been found, would release testimony in such an underhanded and possibly illegal way, totally without authorization, is a disgrace,” Trump tweeted.

“Must have tough Primary!”

The fact that Sneaky Dianne Feinstein, who has on numerous occasions stated that collusion between Trump/Russia has not been found, would release testimony in such an underhanded and possibly illegal way, totally without authorization, is a disgrace. Must have tough Primary! — Donald J. Trump (@realDonaldTrump) January 10, 2018

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A tough primary is unlikely to happen, however, as California’s primary system rewards the top two finishers, irrespective of party, and Feinstein’s only notable challenger at this point is a Democrat.

Still, Feinstein’s release of the Simpson interview transcripts caught Republicans by surprise and provided explosive new details that both parties will look to use to their advantage in the myriad investigations taking place on Capitol Hill surrounding the Trump campaign, Russia, the FBI and the Department of Justice.

The dossier has been central to those investigations, with Democrats claiming it to be a roadmap to collusion and corruption by Trump and his campaign team and Republicans insisting that it is full of unverified claims that the FBI might have used to improperly secure a warrant to spy on Trump’s campaign and transition.

Trump on Wednesday also tweeted his anger at “the single greatest witch hunt in American history” and demanded that Republicans “take control” of the Russia investigations.