Mark Cuban: Trump may be a billionaire after all
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Dallas Mavericks owner Mark Cuban says Donald TrumpDonald John TrumpFed saw risks to US economy fading before coronavirus spread quickened Pro-Trump super PAC hits Biden with new Spanish-language ad in Nevada Britain announces immigration policy barring unskilled migrants MORE may be a billionaire but isn't as wealthy as the presumptive GOP presidential nominee claims.

If Trump is a billionaire, it's "because the price of New York real estate has just skyrocketed over the last five years," Cuban said on CNN's "New Day."

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"Assuming he hasn't had to keep on borrowing because he's had liquidity issues, then yeah, I would give him credit for being a billionaire, but is he worth $10 billion? No," Cuban said. 

Cuban questioned Trump's claim that he's a billionaire and released a video last week mocking the businessman with a lip dub of the pop song "Billionaire" by Travie McCoy and Bruno Mars. 

Forbes estimates that Cuban's net worth is $3.2 billion, while Trump's is $4.5 billion as of September 2015.

Cuban on Monday also dismissed Trump's reason for not releasing his tax returns. Trump has cited an Internal Revenue Service audit.

"That's nonsense, right? There's nothing to preclude you from showing your taxes. You own them; that's your property," Cuban said. 

Trump has also suggested that he may have been audited because of his Christian beliefs.

Cuban similarly laughed off that idea. 

"I get audited every year because I have a lot of money and presumably so does he," said Cuban. He said he spends 45 minutes signing around 50 stacks of paper when his own taxes are prepared each year.

But Cuban also downplayed the controversy over Trump's tax returns.

"They're not really going to be indicative of all that much. I don't care about seeing his tax returns, honestly," Cuban said. 

Cuban has expressed openness to being Trump's running mate, something an aide for the candidate dismissed last week.

"If it were a sneaky play, I'm not being very sneaky, am I?" said Cuban.

"I know tech. Donald doesn't even send emails. Donald doesn't even have a clue about tech," he continued.

 "I think I complement his skill set very well."