However, unlike his father, George W. Bush did not vote for Democratic presidential nominee Hillary Clinton in the 2016 election and instead left the top of his ticket blank. "And I'm not too excited about him being a leader", said George Bush Sr, who was president between 1989 and 1993.
"I don't like him".
George W Bush, adding to his remarks that Mr Trump "doesn't know what it means to be president", said "you can either exploit the anger, incite it, or you can come up with ideas to deal with it".
In the book, titled "The Last Republicans", the 41 president also revealed that he voted for Trump's Democrat rival Clinton in the 2016 White House race.
George Bush Sr and Jr, two former U.S. presidents, have never liked Donald Trump, and now they have gone on record with their blunt assessment of him, calling him a "blowhard" who doesn't know what it means to be the president of the country.
Trump had recently had nice things to say about another former president, Jimmy Carter, whom he once called worst president in USA history.
"And it wasn't just about Hillary Clinton becoming president, as the Republican Party was having a hard time finding itself".
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"He's a blowhard", the 41st president tells historian Mark Updegrove in the book "The Last Republicans", which goes on sale November 14.
The two men have a combined 20 years experience in the White House.
"I voted "None of the Above" for president, and Republican down ballot in 2016", he said of choosing not to support Mr Trump.
The younger Bush also pushed back hard on the widely-held perception during his time in office that his vice president Dick Cheney and secretary of defense Donald Rumsfeld controlled the White House from behind the scenes.
"The Last Republicans" is set to be released on November 14. "At the time, I think he was concerned that Hillary Clinton would win", Updegrove told the Times.
"... If you look at his values and those shared by his father and Ronald Reagan, they are very much in contrast to the values of the Republican Party today, in particular the platform that Donald Trump ran on, which is essentially protectionism and a certain xenophobia", Updegrove told the Times. The Bushes felt stung by Trump's ground-burning attacks that helped destroy the campaign of Jeb Bush, the son and brother of the presidents.