Donald Trump starts the Republican debate by refusing to rule out a third-party run

Fox News's Bret Baier opened up the Republican debate with one question: Who on the stage won't pledge to run an independent campaign should he not win the GOP nomination?

Only one person said they wouldn't make that pledge: Donald Trump. The billionaire said he was weighing his chances. He got booed, and he shrugged. ¯\_(ツ)_/¯

This isn't atypical for Trump, who has repeatedly hinted at a third-party run should he lose. But it's a hell of a start for the first debate that will decide the GOP presidential nominee, showing that the frontrunner isn't even loyal to the party he's running for.

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