Republican nominee Donald Trump has plans of revenge for Ted Cruz and John Kasich after both unsuccessful candidates refused to endorse him despite signing the GOP pledge last year to back the eventual nominee.

The billionaire businessman vowed to create and fund super PACs focused on destroying both politicians if they choose to run for office in the future, whether as gubernatorial, senatorial or presidential candidates, Bloomberg reported Saturday.

"Maybe I'll set up a super PAC if he decides to run," Trump said of Cruz Wednesday at the Cleveland convention.

Trump may shell out $20 million to fund the projects — the cost, apparently, of getting even. He would launch his attack campaigns six months before the election date of either man's race.

But for all the bitterness, Trump is not interested in going after former Florida Gov. Jeb Bush, whom a source close to his campaign described in the Bloomberg interview as already "destroyed."

Kasich cannot run for governor again due to Ohio's one-term limit. The Tea Party Texan is up for re-election in 2018. Both men have voiced interest in running for president again in 2020, even if that means fighting an incumbent Trump for the GOP nomination.