President Donald Trump ripped “sneaky Dianna Feinstein” on Wednesday after the prominent liberal lawmaker independently released congressional transcripts of an interview with Fusion GPS co-founder Glenn Simpson; claiming her move was “possibly illegal.”

The President unloaded on the prominent Senator after she unilaterally published the interview between federal investigators and Simpson, discussing sensitive material regarding the Trump dossier and Fusion GPS, the shady opposition firm behind the debunked document.

“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!” Trump tweeted.

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

Feinstein’s decision to release the transcripts drew confusion and outright anger from fellow Senators who are involved in the ongoing investigation of the Trump dossier. Senate Judiciary Chairman Chuck Grassley called his colleague’s decision “confounding.”