"Lawmakers were saying they have been very concerned about this, the president's dangerousness, the dangers that his mental instability poses on the nation", Lee told CNN.
Others, like Danny Tarkanian, stood by him despite the criticism.
Publisher Henry & Holt Company had planned a Jan. 9 release.
He added that his story "seems to present this presidency in such a way that it says he can't do his job".
Special counsel Robert Mueller is investigating possible collusion as part of a broader probe into alleged Russian meddling in the 2016 election.
"He used Sloppy Steve Bannon, who cried when he got fired and begged for his job". After the president lashed out over the book [VIDEO] on more than one occasion, a host on Fox News criticized Trump bringing the publication so much attention.
On Thursday Rebekah Mercer issued a statement distancing her family from Bannon.
Donald Trump did not know what Brexit was a fortnight before the EU referendum, the author of a sensational new book about the US President has claimed. The publisher moved up the release by four days.
The White House has repeatedly denied collusion and labeled the Mueller probe a "witch hunt". In interviews after the news broke with the conservative Breitbart News website, he called Trump a "great man" and pledged continued support for the president's agenda.
"The one description that everyone gave, everyone has in common - they all say he is like a child", Wolff said.
At the Barnes & Noble in Camp Hill, an employee said the chain retailer is taking reservations for Wolff's book, which was rushed to hit bookstores today. He also said he had spoken to Trump since the inauguration.
"What's the president's reaction to the growing number of suggestions, both in this book and in the media, that he's mentally unfit to serve as president?"
"Steve Bannon has nothing to do with me or my presidency", Trump said Wednesday in a statement.
"Why? You've already done enough for him".
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