(CNN) –A former top adviser and spokeswoman to John McCain's 2008 presidential campaign is pushing back against comments reportedly made by Sarah Palin in her new book.

Nicolle Wallace tells CNN that Palin's account of an ill-fated interview with CBS's Katie Couric during the 2008 presidential campaign is not true.

In excerpts of her new book "Going Rogue: An American Life" that were obtained by other organizations, including the conservative website Drudge report, the former Alaska Governor and former Republican vice presidential nominee discusses her interview with Couric.

"From the beginning, Nicolle [Wallace] pushed for Katie Couric and the CBS Evening News. The campaign's general strategy involved coming out with a network anchor, someone they felt had treated John well on the trail thus far. My suggestion was that we be consistent with that strategy and start talking to outlets like FOX and the Wall Street Journal. I really didn't have a say in which press I was going to talk to, but for some reason Nicolle seemed compelled to get me on the Katie bandwagon," writes Palin, according to excerpts obtained before Tuesday's release date for the highly anticipated book.

Drudge report says it obtained a portion of the book in which Palin claims McCain campaign adviser Nicolle Wallace pushed for the now famous Katie Couric interview because the CBS anchor needed a self-esteem "boost."

"'She just has such low self-esteem,' Nicolle said. She added that Katie was going through a tough time, 'She just feels she can't trust anybody.' Nicolle had left her gig at CBS just a few months earlier to hook up with the McCain campaign," continues Palin in the excerpt.

Contacted by CNN, Wallace denied the gist and specifics of Palin's account of the Couric interview, which aired at the end of September 2008.

Palin and Wallace do agree that the Couric interview didn't go well.

"I knew it wasn't a good interview," Palin tells Oprah Winfrey, in excerpts of an interview that is scheduled to run Monday, one day before Palin's book officially releases.

In excerpts of the book, Palin also writes that she thought there was something peculiar about the way Wallace would talk about her days as White House Communications Director for President George W. Bush.

"I had to trust her experience, as she had dealt with national politics more than I had. But something always struck me as peculiar about the way she recalled her days in the White House, when she was speaking on behalf of President George W. Bush. She didn't have much to say that was positive about her former boss or the job in general. Whenever I wanted to give a shout-out to the White House's homeland security efforts after 9/11, we were told we couldn't do it. I didn't know if that was Nicolle's call," writes Palin, according to the excerpts.

Wallace said Palin's account is completely false.

"It's not even like it's slightly wrong. It's like I feel totally the opposite. I would never disparage the President. I adored him then and I adore him now."

Wallace seemed mystified by Palin's accounts, conceding that there were enough strategy miscalculations during the campaign that Palin "didn't have to make stuff up."