Billionaire businessman Mark Cuban claimed Friday that Donald Trump is not rich enough to self-finance his campaign.

The NBA Dallas Mavericks owner told MSNBC host Chris Hayes his friendship with the presumptive Republican presidential nominee has unraveled as a result of his calling out Trump's lying about his wealth.

"He can't afford to self-finance no matter what he says," Cuban said.

Cuban, a self-described independent voter, said he recently took 15 minutes to add up Trump's reported finances and the billionaire is less well-off than he has claimed.

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