Mark Cuban. Slaven Vlasic/Getty Images Billionaire businessman Mark Cuban told CNN on Tuesday that he has no doubts about the onslaught of allegations of unwated sexual advances recently levied against Donald Trump because Cuban knows someone who had a similar experience with the now Republican presidential nominee.

"I know one, and it just didn't happen recently," Cuban told CNN host Don Lemon. "I'd — my friend reminded and it was from 2000 and she — you know, I don't expect her to come forward. I wouldn't recommend she come forward."

The business mogul added that he also knows "somebody else" from two years ago "that won't come forward."

"It's not anything that caught me by surprise," Cuban said. "I can tell you — my friend that was dating this one woman ... reminded me of the story they told me right after it happened and put it all down in detail. And, obviously, I remembered it."

He continued: "And then I had another person who contacted me after the race started and told me a story. But I don't want to go in, since it's all second- and thirdhand, other than to say that it's absolutely factually true. So I don't have any doubt that we’re hearing is true."

A score of women have recently come forward with allegations that Trump made unwanted sexual advances on them in the past. Trump has strongly denied the claims.

The flood of accusations came after a leaked 2005 tape showed Trump making crude sexual remarks about women, saying he was able to grope women and kiss them regardless of their consent because of his celebrity status. He later apologized and said the remarks were just "locker room talk."

Cuban has supported Democratic presidential nominee Hillary Clinton since he endorsed her in July at a Pittsburgh rally.

He has ripped Trump repeatedly on social media and in interviews, calling him the most "dangerous" presidential candidate he could imagine during a recent interview with Business Insider. Last month, Cuban offered Trump $10 million to hold a four-hour policy debate with him.

Earlier in the cycle, he was more enthralled by a potential Trump presidency, and at different points said he'd be interested in serving as either Trump's or Clinton's running mate.