A top billionaire Republican donor says he's disappointed Speaker Paul RyanPaul Davis RyanHow does the 25th Amendment work? Sinema, Fitzpatrick call for long-term extension of Violence Against Women Act GOP super PAC drops .5 million on Nevada ad campaign MORE (R-Wis.) hasn't yet backed presumptive nominee Donald TrumpDonald John TrumpHannity urges Trump not to fire 'anybody' after Rosenstein report Ben Carson appears to tie allegation against Kavanaugh to socialist plot Five takeaways from Cruz, O'Rourke's fiery first debate MORE.

“I’m very disappointed,” businessman Stanley Hubbard said on Fox Business Network on Monday. "Sorry, did I approve of all Donald Trump did and all that he said? No, but he’s a candidate who would be a heck of a lot better than Hillary ClintonHillary Diane Rodham ClintonFive takeaways from Cruz, O'Rourke's fiery first debate Heller embraces Trump in risky attempt to survive in November Live coverage: Cruz, O'Rourke clash in Texas debate MORE.

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“I don’t think Trump’s a fool,” the Hubbard Broadcasting CEO added. "He’s proven he’s a winner. I think he’s still our best choice.

His comments come after Ryan said last week that he wasn't ready to support Trump yet but hopes to find common ground. The two are scheduled to meet on Thursday.

“Although he wasn’t my favorite candidate, I think he will moderate a lot of his views. If you leave him, you’re going to have Hillary as president – simple as that," said Hubbard.

Hubbard also criticized other prominent Republicans who are not embracing Trump.

“Mitt Romney was a terrible candidate who didn’t understand how to reach the common person,” he said of the GOP’s 2012 nominee.

“I’m disappointed in the Bushes because it didn’t go their way so they’re going to take their ball and go home,” he continued, about former Presidents George H.W. Bush and George W. Bush.

“Anybody who wants to see sensible government and get away from the Obama message should get on board, whether they love Trump or not,” he added.

Hubbard told The Hill last week that he would contribute to Trump despite previously giving $10,000 to Our Principles PAC, an anti-Trump group.

Romney is skipping the Republican National Convention in July, as are George H.W. Bush and George W. Bush.

Hubbard on Monday said Clinton would help unite Republicans behind Trump.

“I think as time goes by, people are going to realize we have two choices – either Donald Trump, who may not be our favorite choice, and Hillary Clinton, who’s our worst choice."