Hunter Biden’s former business partner, whose claims of wrongdoing by the first son and his father have largely fallen apart under scrutiny, filed a $10 million federal lawsuit on Monday over accusations he was “involved with some sort of shady business dealing.”

The suit brought by Tony Bobulinski, the House GOP’s “star witness” in its ongoing and thus far, unsuccessful attempt at connecting President Joe Biden to Hunter’s overseas deals, alleges former White House aide Cassidy Hutchinson defamed him in her bombshell memoir, Enough.

In the lawsuit, Bobulinski—who has close ties to a particularly unsavory Russian oligarch presently on a U.S. blacklist—dubs himself “a decorated Navy veteran who put his country above politics,” and contends he is being treated unfairly “[b]ecause [he] did not pledge blind loyalty to the Democrat Party and to the Biden family.” But in describing Hutchinson as a liar, Bobulinski cites a trio of far-right conspiracy theorists, one of whom was banned from Twitter and Facebook for spreading falsehoods about the 2020 election, as “proof” of his assertions.