Former President George W. Bush and his father, former President George H.W. Bush, both criticize President Trump in a new book to be released this month, with George W. Bush admitting that, despite Trump’s political affiliation, he’s worried “that I will be the last Republican president.”

George H.W. Bush also calls Trump a “blowhard” in the book, “The Last Republicans,” by Mark K. Updegrove, which was previewed by The New York Times and CNN on Friday.

"I don't like him. I don't know much about him, but I know he's a blowhard. And I'm not too excited about him being a leader,” the senior Bush said, according to the author. He also commented on Trump’s “ego.”

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“Wow, this guy doesn't know what it means to be president,” the younger Bush said. He indicated that a president should not “exploit the anger, incite it” but rather “come up with ideas to deal with it.”

Neither man voted for Trump in the last election, and George H.W. Bush confirms in the book that he voted for Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE. George W. Bush said he left the top of his ballot blank and did not vote for Clinton because she has “bad judgment.”

The White House on Saturday responded to the criticism revealed in the new book.

"The American people voted to elect an outsider who is capable of implementing real, positive, and needed change - instead of a lifelong politician beholden to special interests," White House press secretary Sarah Huckabee Sanders said in a statement. "If they were interested in continuing decades of costly mistakes, another establishment politician more concerned with putting politics over people would have won.”

— Updated 1:30 p.m.