Billionaire Mark Cuban is giving President Trump 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 TrumpDonald John TrumpAssange meets U.S. congressman, vows to prove Russia did not leak him documents A history lesson on the Confederacy for President Trump GOP senator: Trump hasn't 'changed much' since campaign MORE, he's doing a phenomenal job."

Cuban, who also stars on ABC's "Shark Tank" reality show, endorsed Hillary ClintonHillary Rodham ClintonAssange meets U.S. congressman, vows to prove Russia did not leak him documents High-ranking FBI official leaves Russia probe OPINION | Steve Bannon is Trump's indispensable man — don't sacrifice him to the critics MORE in the 2016 presidential election.