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Former Vice President Kamala Harris revealed in her upcoming book, "107 Days," that then-President Joe Biden rattled her right before she went head-to-head with then-candidate Donald Trump on the debate stage.

Biden reportedly called Harris as she sat in a hotel room preparing for the only debate of her abbreviated campaign. He apparently wanted to wish her luck — and to scold her.

The then-president said, "My brother called. He’s been talking to a group of real power brokers in Philly," according to an excerpt of the book in The Guardian . He then allegedly asked if Harris was familiar with several people related to the matter, which she was not.

KAMALA HARRIS COMPLAINS ABOUT 'IMPOSSIBLE' LACK OF SUPPORT FROM BIDEN'S C

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