Republican presidential front-runner Donald TrumpDonald TrumpRomney blasts end of filibuster, expansion of SCOTUS McConnell, GOP slam Biden's executive order on SCOTUS US raises concerns about Iran's seriousness in nuclear talks MORE is sending a warning to GOP leaders about his dominance in the polls: “You’ve got to get used to it.” 

During an interview with Fox News’s Chris WallaceChristopher (Chris) WallaceAnne Frank's stepsister: Trump 'obviously admired Hitler' The Hill's Morning Report - Biden's infrastructure plan triggers definition debate Battle lines drawn on Biden's infrastructure plan MORE, the billionaire said Republicans are “kidding themselves” if they think he won’t secure the GOP nomination. 

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“I say, folks, you know, I’m sorry I did this to you, but you’ve got to get used to it,” Trump said. “It’s one of those little problems in life.” 

“I’m going to win. ... You know, I’m not one of these other guys that goes down. I don’t go down. I go up.”  

Trump’s interview with Wallace is set to air Sunday at 6 p.m.