Donald TrumpDonald TrumpHarris stumps for McAuliffe in Virginia On The Money — Sussing out what Sinema wants Hillicon Valley — Presented by Xerox — The Facebook Oversight Board is not pleased MORE is still flirting with a third-party campaign days after meeting with the chair of the RNC.

"It's not that simple," Trump said in an interview on "Fox News Sunday" when asked if he would rule out a third-party run. "I’m by far the front-runner as a Republican. I want to run as a Republican. I will beat Hillary ClintonHillary Diane Rodham ClintonMeghan McCain: 'SNL' parodies made me feel like 'laughing stock of the country' Hill: Trump reelection would spur 'one constitutional crisis after another' Trump defends indicted GOP congressman MORE."

When host Chris Wallace asked what he would do if he didn't get the nomination, Trump responded: "We’re going to have to see how I was treated. I'm going to have to see how I was treated, very simple."

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Trump has previously toyed with the idea of a third-party bid, but later committed to the GOP by signing a loyalty pledge to support the eventual nominee. 

However, Trump, along with Ted CruzRafael (Ted) Edward CruzOvernight Health Care — Presented by Carequest — Colin Powell's death highlights risks for immunocompromised The Senate confirmation process is broken — Senate Democrats can fix it Australian politician on Cruz, vaccines: 'We don't need your lectures, thanks mate' MORE and John Kasich, has been backing away from that promise.

Trump met with RNC Chairman Reince Priebus this week. After the meeting, Trump said on Fox's "The O'Reilly Factor": "I think they wanted to really discuss unity, and I like discussing unity, too."

Priebus has said he's not worried about the party coming together after the convention this summer. 

The full interview is set to air on Fox News at 10 a.m. Sunday.