A man House Republicans had previously claimed was a whistleblower on Joe Biden’s corruption categorically debunked all of the GOP’s accusations in a closed-door hearing on Tuesday.

Eric Schwerin, a longtime business partner of Hunter Biden, testified in front of the House Oversight and Judiciary Committees in a closed-door interview. Schwerin also worked as a financial adviser for Joe Biden from 2009 until 2017, during which time he was able to see transactions in and out of the then vice president’s bank accounts.

“Based on that insight, I am not aware of any financial transactions or compensation that Vice President Biden received related to business conducted by any of his family members or their associates nor any involvement by him in their businesses,” Schwerin said in a prepared opening statement obtained by The New Republic.

Republicans have repeatedly accused Biden of profiting from his son Hunter’s overseas business dealings. House Oversight Committee Chair James Comer has spearheaded the impeachment inquiry into Biden, accusing the president and first son of influence peddling and accepting bribes. He has yet to produce any evidence of Biden’s wrongdoing.

Comer had listed Schwerin as one of the many supposed whistleblowers who spoke to Oversight Committee investigators about the Biden family. In March, Comer said four whistleblowers had come forward. But when committee Democrats asked him to share the new information, they were told that there wasn’t actually any new witness information. Comer’s statements referred to just two people: Schwerin and Kathy Chung, who worked as Biden’s executive assistant when he was vice president.

But in his statement Tuesday, Schwerin said Biden had not been involved, either as a public official or a private citizen, in Hunter’s business dealings, nor had he ever been asked to take action on Hunter’s behalf. Schwerin said that in his role as Hunter’s business partner, he never asked Biden to get involved with their work. He and Hunter never suggested to or promised their clients or associates that Biden would get involved, either.

“In my discussions with the Vice President concerning his personal finances, he was always crystal clear that he wanted to take the most transparent and ethical approach consistent with both the spirit and the letter of the law,” Schwerin said. “Given my awareness of his finances and the explicit directions he gave to his financial advisers, the allegation that he would engage in any improper conduct to benefit himself or his family is preposterous to me.”

This is far from the first time that one of Republicans’ star witnesses in the Biden corruption investigation has completely debunked their claims. One such witness was Devon Archer, another of Hunter’s business partners. In his testimony, Archer said he was “not aware of any” wrongdoing by the president and said he disagreed with the allegation that Biden accepted a bribe. Republicans then refused to let Democrats introduce Archer’s testimony as evidence during a September hearing.