Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE won't invite former rivals Sen. Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE (R-Texas) and Ohio Gov. John Kasich to speak at the Republican National Convention without endorsements from both, he told The New York Times.

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"If there's no endorsement, then I would not invite them to speak," Trump said.

Trump's comments come as his campaign and the Republican National Committee work to ensure next month's convention goes as smoothly as possible.

There have been rumblings that displeased delegates will stage a revolt to try to oust the presumptive Republican nominee, but RNC leaders are threatening to withhold speaking slots and warning that attempting to undermine Trump violates party rules, the Times reported.

Trump told the Times his opponents will fail in derailing his nomination.

"You mean to tell me we're going to get the largest vote in his history of the Republican primaries and now the same people that either didn't run or get beaten in a landslide are going to try and back-end?" Trump said.

"My supporters are tremendously loyal to me. They would not stand for it."

Under party rules, Trump cannot deny Cruz a speaking opportunity. Because Cruz won a majority of delegates in at least eight states, he will likely have his name entered into nomination, guaranteeing him a speaking spot.

At a rally earlier this month, Trump said he would rather have athletes speak at the convention instead of politicians, seeming to take issue with speeches that don't center on the nominee.

"What I'm thinking about doing for the convention is rather [than] these politicians, you know — they're gonna get up and speak and speak and speak," Trump said at a rally in Richmond, Va. "You remember last time with [Mitt] Romney, all these politicians got up and they kept speaking and they didn't mention Romney's name. They spoke — one guy spoke for like 45 minutes. He never mentioned Romney's name.

"Well we're going to do it a little differently, if it's OK."