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Scoop: Wolff taped interviews with Bannon, top officials
Michael Wolff interviews Kellyanne Conway at the Newseum in April. (AP's Carolyn Kaster)

Michael Wolff has tapes to back up quotes in his incendiary book — dozens of hours of them.

Among the sources he taped, I'm told, are Steve Bannon and former White House deputy chief of staff Katie Walsh.