Republican presidential front-runner Donald TrumpDonald TrumpMajority of Americans in new poll say it would be bad for the country if Trump ran in 2024 ,800 bottle of whiskey given to Pompeo by Japan is missing Liz Cheney says her father is 'deeply troubled' about the state of the Republican Party MORE said in an interview aired Sunday that he wouldn’t rule out a run as a third-party candidate if he doesn't win the GOP nomination.

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“It’s not a question of win or lose; it’s a question of treatment,” Trump said on "Fox News Sunday."

“I’m by far the front-runner. I want to run as a Republican. I will beat [Democratic front-runner] Hillary ClintonHillary Diane Rodham ClintonBriahna Joy Gray: Progressives like Turner should reconsider running as Democrats Biden wishes Obama a happy birthday Ohio special election: A good day for Democrats MORE. I’m going to have to see how I was treated.”

Trump said he has concerns the Republican Party may try to “steal” the nomination from him if he doesn’t make it to the convention with the necessary 1,237 delegates to clinch the nomination outright.

Trump first raised the prospect of a third-party run during an exclusive interview with The Hill last summer.

—This breaking news report will be updated.