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's campaign manager, Robby Mook, said they still haven't found a person to play 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 in mock presidential debates.

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"It's very hard to find someone to mimic the reckless temperament and the hateful instincts and divisive instincts of Donald Trump," Mook said Sunday on CNN's "State of the Union."

"Preparing for a debate with him is a challenging task, but Secretary Clinton is looking forward to the debate."

Mook said he expects the public will see a stark difference between "steady leadership" and a "very reckless temperament" during the presidential debates.

Clinton, the Democratic presidential nominee, has been "in this game" for a long time, he said, noting that she's had a lot of "tough things" said to her.

The challenge in this situation is finding someone able to recreate the Republican presidential nominee's divisive and hateful rhetoric, Mook said.

But he said he's confident the campaign will find someone.

"We'll get it done," he said.

"We're looking forward to the debates."