Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE has never faced someone like Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE in a debate, said her chief campaign strategist, Joel Benenson.

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"I think the big question is: Can Donald go toe-to-toe with someone as formidable as Hillary Clinton? She's outworked him. She's out-campaigned him. We've run a much stronger campaign," Benenson said on John Catsimatidis's radio show, "The Cats Roundtable," on Sunday.

He also pointed out that Trump, the Republican presidential nominee, has never debated anyone one on one.

"This is going to be one on one. There's going to be no dodging or ducking, none of the stuff that worked for him in the primaries," he said.

The first presidential debate is Sept. 26 in Hempstead, N.Y.

Benenson also pointed to Trump's recent campaign shake-up as proof that he's still struggling to adjust to the general election.

Trump's campaign chairman, Paul Manafort, resigned Friday after the Republican presidential nominee brought on two new campaign leaders.

"This is a guy — he just had another campaign shake-up. He had another resignation. He's firing people. He's on his third campaign manager," Benenson said.