“It’s inevitable that there’s going to be a brokered convention at this point,” Beightol said, adding that he might soon start donating and fundraising for Rubio’s campaign because it’s been doing the math and preparing for the scenario…

Hubbard said he still likes John Kasich of the candidates remaining, but decided to give $10,000 to the anti-Trump group Our Principles PAC in an effort to keep Trump from getting the delegates he needs because the chances of any of the other candidates winning outright are low.

“My hope is that no one is able to win the delegates and then it goes to a convention,” Hubbard said, admitting, however, that as much as some donors would like to see one, chances of a contested convention actually happening were “fair to slim.”

After months of not taking Trump seriously, a few major GOP donors other than Hubbard, including hedge-fund billionaire Paul Singer are now contributing to the anti-Trump super PAC to keep him below the 1,237 delegates he needs to secure the GOP nomination.