James Biden, the brother of Joe Biden, told executives at a massive healthcare firm that a cancer initiative being pushed by the former vice president could be used to promote their business, according to a participant in the conversation who talked to Politico.

Biden’s brother, James, made the promise to executives at Florida-based Integrate Oral Care during a phone call on or around November 8, 2018, according to Michael Frey, CEO of Diverse Medical Management, a health-care firm that is suing James Biden. At the time, James Biden’s business partners were pursuing a potential investment in Integrate, according to Frey and court records. Frey, who had a business relationship with James Biden and his associates, had introduced the group to Integrate. James Biden told the Integrate executives that he would get the Biden Cancer Initiative to promote an oral rinse made by the firm and used by cancer patients, Frey, who said he participated in the call, told POLITICO. He added that James Biden directly invoked the former vice president on the call. “He said his brother would be very excited about this product,” Frey said.

Frey, who said he was on the phone call, claims that an investment offer from Biden was part of a scheme to steal the company’s business model, Politico reported. And he said James Biden told the executives that the his brother “would be very excited” about an oral rinse made by Integrate Oral Care that is used by cancer patients.

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Through a spokesman, the vice president’s brother denied the allegation. “These charges stem from a frivolous lawsuit and are pure fantasy. We are not surprised that such baseless accusations have emerged during the Democratic primaries,” David Fuscus, a spokesman for James Biden, told FOX Business.

“Jim Biden has been clear and consistent that he does not, and has never, discussed his business ventures with his brother,” Fuscus said.

Joe Biden has also denied the allegation. “I have never discussed with my son or my brother or anyone else anything having to do with their businesses. Period,” Biden told reporters in August.