Republican presidential front-runner Donald TrumpDonald John TrumpJoe Arpaio loses bid for his old position as sheriff Trump brushes off view that Russia denigrating Biden: 'Nobody's been tougher on Russia than I have' Trump tees up executive orders on economy but won't sign yet 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 ClintonDemocratic convention lineup to include Ocasio-Cortez, Clinton, Warren: reports Trump brushes off view that Russia denigrating Biden: 'Nobody's been tougher on Russia than I have' Kanye West 'not denying' his campaign seeks to damage Biden 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.