Former Republican National Committee Chairman Michael Steele said Friday he thinks Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE will be the Republican nominee for president.

“I’m gonna say this and I know people are going to scratch their heads and go ‘what?’ but I don’t think he can [be stopped],” Steele said on 1210 WPHT in an interview posted by BuzzFeed News. “That window has closed and I think Donald Trump effectively closed it over the last couple of months.

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“You tell me who stops him and when do they do it,” he added, noting Trump’s strong positions in the polls.

“I don’t see how that momentum gets stopped right now,” he added. “I don’t know who breaks it. Come on, you’ve had eight months. You’ve had eight months to take him down.”

Steele said Trump’s performance in the debate Thursday night showed his growth as a candidate.

“You can see the maturity,” he said, adding that Trump was likely thinking that he wanted to “demonstrate to people that I can be president.”

“I think he showed a little bit of that last night,” Steele said.