Mark Cuban Just Attacked Donald Trump’s Businesses

June 2, 2016, 5:18 PM UTC

Mark Cuban just made it very clear he doesn’t think too highly of Donald Trump’s businesses.

The billionaire entrepreneur and Shark Tank reality television star attacked the Republican presidential nominee in a recent interview on WABC’s The Bernie and Sid Show (you can find the full audio of the radio segment here).

During the program, Cuban said he looked at Trump’s SEC filings and tried to determine his net worth. Cuban’s comments come weeks after Fortune’s cover story examining the real estate mogul’s finances, which estimated Trump’s net worth is $3.72 billion and not the $10 billion he claims. Since then Fortune has updated our number and now put Trump’s worth at $3.92 billion, based on his most recent filings.

“I know what I’m good at, and I know what I’m not good at. I’m not so sure Donald knows what he’s not good at….What he’s done well is put his name on big, big buildings,” Cuban said during the interview. “He’s good at that. Whether or not that’s made him a billionaire, I don’t know. He’s not transparent enough for us to actually know.”

Cuban, however, doesn’t believe Trump has made good decisions with his other brands, including steaks and water.

“When you’re putting your name on steaks, and you’re putting your name on water, you’re putting your name on playing cards, you’re putting your name on all this nonsense, right—you’re not gonna make big bucks, no matter what,” Cuban said. “It’s not like Trump Steaks were gonna make him $100 million. It’s not like it was gonna make him $5 million.”

[playbuzz-item url=”//”]

Cuban, who has a reported net worth of about $3.2 billion, added, “I don’t think he’s very good at brands for non-real estate products. And, to me, it’s more a reflection of desperation.”

This isn’t the first time Cuban has made his thoughts on Trump clear publicly. In May, he compared the presidential candidate to a womanizer and drunk. Interestingly, he’s also said in the past that he’d consider running as Trump’s vice president.

Fortune has reached out to Trump’s campaign for comment and will update this post if we hear back.