Billionaire Mark Cuban kept up his attacks on Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Tuesday, mocking the presumptive Republican nominee’s intelligence and blasting his business record.

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“It’s rare that you see someone get stupider before your eyes, but he’s really working at it,” he said of Trump in an interview with Extra. “You have to give him credit. It’s a difficult thing to do, but he’s accomplished it.”

He also blasted the real estate mogul for his casinos that have gone out of business, saying he couldn’t think of a good deal Trump has negotiated.

“When he talks about his great renegotiations, they’re renegotiations, so tell me if you think this is a good deal: I lose four casinos, they go out of business, but I’m really good at renegotiating the debt of his companies that have already gone out of business,” Cuban said of Trump’s bankrupted Atlantic City casinos.

“He’d get kicked out of 'Shark Tank' so fast, it would make your head spin,” he said, making a reference to the reality show he’s an investor in.