Billionaire Mark Cuban is giving President TrumpDonald John TrumpFormer Watergate prosecutor: Trump taking the fifth would be political suicide Comey: I’m ‘embarrassed and ashamed’ by Republican party Comey, Anderson Cooper clash over whether memo release violated FBI rules MORE a C-minus on his first 100 days in office.

Asked during an interview on CNN's "New Day" how he would grade Trump's early performance as president, the Dallas Mavericks owner said he would give the real estate mogul a C-minus, arguing that he hasn't implemented any major policy changes since his January inauguration.

"There are some things that he's tried to do," Cuban, an outspoken Trump critic, said in an interview on CNN's "New Day." "I give him credit for the Supreme Court."

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"It's a low bar when you do what you say you're going to do," he continued. "No major policy changes at all. Signs a lot of executive orders that he doesn't truly understand. But, you know, there's still hope."

But Cuban also said that, despite Trump's rocky start in office, his supporters see him as fulfilling his promise to shake up Washington by delivering what Cuban calls "political chemotherapy."

"Is he poisonous in a lot of respects? Yeah, this is our chemotherapy," Cuban said. "We hope he's going to change the political system. And if that's the way you're evaluating Donald Trump, he's doing a phenomenal job."

Cuban, who also stars on ABC's "Shark Tank" reality show, endorsed Hillary ClintonHillary Diane Rodham ClintonKim Kardashian West defends Kanye on Trump: 'He's a free thinker, is that not allowed?' Trump comments on Fifth Amendment resurface after Cohen filing The 'Handmaid's Tale' liberal feminists created MORE in the 2016 presidential election.