Republican National Committee Chairman Reince Priebus predicted on Sunday that GOP presidential nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE will be “consistent” and “measured” at the first presidential debate Monday night.

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During a radio interview with John Catsimatidis that aired Sunday, Priebus said Trump’s chances of winning the election have improved as he becomes a more disciplined candidate.

“This is a change election,” he said. “And so the polls go up, while Donald Trump becomes steady. His message discipline has improved. He’s being consistent, mature, measured — all of those things give the electorate confidence. And so as the electorate gets confident in the change candidate, that’s when things improve for Donald Trump, and it’ll continue to get better.

“And I think that one of the biggest things with the debate tomorrow is that consistent, measured candidate on that stage — and I think that’s what you’re going to see from Donald Trump."