Guest hosting "Tucker Carlson Tonight," Fox News' Brian Kilmeade added a caveat to a former Democratic Party mega-donor's recitation of statistics backing his claim that COVID-19 vaccines are "the most dangerous ever created."

"We can't verify those numbers," Kilmeade said in response to Silicon Valley entrepreneur Steve Kirsch, who says he has given a total of more than $20 million to Democratic candidates and causes.

Kilmeade was reacting specifically to an unscientific sampling of people who attended conservative-libertarian businessman and talk-radio host Wayne Root's wedding that nevertheless is consistent with other data, Kirsch contends.

Kirsch said in a Substack post after the interview that he has offered Fox News the opportunity to verify his numbers.