But under Updegrove's analysis of their values and those of past Republican presidents compared to Trump's exhibition of Republicanism, the title still stands.
The elder Bush spent eight years in Ronald Reagan's administration as vice president and four years in the oval office as president, while the younger Bush was president for eight years.
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. "I'm anxious that I will be the last Republican president", the younger Bush told Updegrove at one point during the campaign.
The New York Times spoke with Updegrove about the book and reports that George H.W. and George W. expressed themselves differently with regard to President Trump. During Trump's campaign, Bush said he felt Trump had "a certain ego" and felt he'd need to have "humility" in order to unite the country. His son has been mostly measured in his public comments of Trump.
"President Trump remains focused on keeping his promises to the American people by bringing back jobs, promoting an "America First" foreign policy and standing up for the forgotten men and women of our great county", the official said.
"This guy doesn't know what it means to be president", he said.
NVIDIA GeForce GTX 1080 Ti specs, release date, price
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"I voted "None of the Above" for president", the younger Bush told the author, according to his book.
Who did the former presidents vote for in 2016?
These statements were reportedly made before the election.
"We should have never been in Iraq", Trump continued.
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".
"If they were interested in continuing decades of costly mistakes, another establishment politician more concerned with putting politics over people would have won".
A White House official told CNN, in response to the Bushes' comments, "If one presidential candidate can disassemble a political party, it speaks volumes about how strong a legacy its past two presidents really had".
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