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Marco Rubio and Donald Trump clash on stage as Ted Cruz stands by during the 2016 Fox News Republican debate on March, 3, 2016. | Getty Trump's rivals call him unfit, agree to support him if he's GOP nominee

Donald Trump's GOP primary rivals on Thursday night said that the billionaire businessman is unfit to be president. Then they pledged they would support his run for president if he's the Republican nominee.

Each of the four remaining presidential candidates was asked if they'd honor a 2015 pledge they made to support the GOP nominee — and not mount a third-party run against that nominee — in the general election, and all four answered yes.

“Even if it’s not me?" Trump said with a laugh when moderators asked him if he'd support one of his rivals should he lose the GOP primary. Trump then stated he had brought many people to the Republican Party and that he would give other candidates credit as well, "even if they don't deserve it."

"But the answer is, yes I will," he said.