"I hope she sells lots of them," McCain told the Hill newspaper.
Palin, who served as McCain's vice presidential running mate in the 2008 presidential election, accuses the McCain staff of micro-managing her and keeping her from the press, among other things.
Some members of McCain's campaign staff have disputed her claims, and factual errors from her book have come to light, as well as discrepancies in her claims.
McCain has largely stayed out of the debate over the veracity of Palin's claims, but he told the Hill that it was untrue that she was sent a $50,000 legal bill to pay for the vice presidential vetting process. He said the bill was in fact to pay for legal fees related to the "Troopergate" investigation into an alleged abuse of power by Palin.
"That was over the troopergate," McCain said, referring to the investigation into Palin's attempts to fire her ex-brother-in-law, state Trooper Mike Wooten.
Meanwhile, Palin continues to promote her book with media interviews as well as on her new Twitter page, @SarahPalinUSA, which shows the dates and locations of some of the stops on her book tour. Palin has yet to leave any messages on her new Twitter account and is not "following" anyone on the social networking site, but she has already amassed more than 18,800 "followers."
More Coverage of Sarah Palin:
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Exclusive: Palin Accounts Disputed by McCain Aides
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Fact Check: Palin Contradicts Her Own Version Of Events With Oprah
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