Harris is seeking to debate Trump with live microphones for the entirety of the debate, claiming Trump is “surrendering to his advisors” who do not have “confidence in him.” Miller claimed the Harris campaign realized it was in “real trouble” when it went into debate preparation and is now seeking “a way out.”

“And it’s mind-boggling because you would think that they’d want to debate, the American public does deserve this,” Miller said on Fox News’s Sunday Morning Futures with Maria Bartiromo, guest-hosted by Sean Duffy. “But they refuse to accept the terms of the debate, which, again, everyone had already agreed to it. We’d agreed to it, ABC’s agreed to it. The rules are the rules, they’re not changing. But Kamala Harris and her campaign, they’re afraid.”

Miller also previewed what Trump is doing to prepare for the debate, which ultimately comes down to reminding people they were “better off” under Trump’s leadership. He added that Trump has reviewed Harris’s entire record as a district attorney, an attorney general, and a vice president.

“You can’t prepare for President Trump in the debate,” Miller said. “He’s the ultimate counterpuncher, and that’s why he’s the greatest debater that I’ve ever seen. You can’t prepare for him, so we’re going to be ready, and we have that real simple message how we can make life better for people immediately.”

ABC News, the network hosting the debate scheduled for Sept. 10, sent proposed rules to the Harris and Trump campaigns, which include the same muted mic rules CNN used for its debate. While the Trump campaign agreed to these rules, the Harris campaign hasn’t yet.

The former president said he is looking forward to the debate, adding that Harris will be “exposed” to voters.