The only two living Republicans presidents to precede Donald Trump openly castigated him in interviews last year, an extraordinary rebuke revealed in a new book on president George W. Bush and his father.

Former president George H.W. Bush mocked Trump as a “blowhard” and voted for a Democrat over him, while the younger Bush worried aloud that Trump would destroy the idea of a Republican president in all but name, according to The Last Republicans, which is scheduled to go on sale later this month.

The author, Mark Updegrove, interviewed the Bushes last year — long before Trump’s inauguration — and found neither wanted to see the coarse, populist campaigner become president.

“I don’t like him,” George H.W. Bush told Updegrove in May 2016, according to CNN. “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.”

Not only did the Bush presidents lament the prospect of a Trump presidency, Updegrove told CNN — they even shunned their party’s nominee on Election Day.

The younger Bush reportedly ticked “None of the above” when it came time to choose a president.

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The elder Bush told the author he voted for Hillary Clinton, a Democrat.

During the presidential campaign, Trump had famously cited himself as his own best foreign policy adviser. “Because I have a very good brain and I’ve said a lot of things,” said the candidate, who had no diplomatic or military experience.

Upon learning this, Updegrove told CNN, George W. Bush told him, “Wow, this guy doesn’t know what it means to be president.”

Those comments came as Trump neared the Republican nomination for president, having vanquished most other contenders, including another member of the Bush family, former Florida Gov. Jeb Bush.

The White House responded after quotes from the book were published on Saturday, entering an extraordinary war of words involving three presidents from the same party.

“If one presidential candidate can disassemble a political party, it speaks volumes about how strong a legacy its past two presidents really had,” the White House wrote to CNN. It called the younger Bush’s decision to wage war on Iraq “one of the greatest foreign policy mistakes in American history.”

George W. Bush didn’t expect Trump to win the general election, according to the author.

“When Trump started to rise, I think he became concerned because he saw this populism of Donald Trump getting in the way of America’s position in the world,” said Updegrove, who founded the National Medal of Honour Museum this year, after several years as director of LBJ Presidential Library.

As he watched Trump’s campaign, the younger Bush feared he would “be the last Republican president,” the author told CNN.

“And it wasn’t just about Hillary Clinton becoming president,” he said. “It was because Donald Trump represented everything that the Bushes abhorred.”

Trump stood for rudeness, international isolationism and weak leadership in the eyes of the BushesEND, according to CNN. This would track with a speech George W. Bush gave last month, in which he didn’t name the president but lamented these same vices and politics that “seems more vulnerable to conspiracy theories and outright fabrication.”

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Despite such reservations by the Bushes and other establishment Republicans, Trump — who has made more than 1,300 false or misleading claims in less than a year and almost constantly insults his many rivals, including upending the Republican primary with stinging attacks on “low energy” Jeb Bush — did win the presidency.

It’s rare in the modern political era for former presidents to openly criticize their successors.

Trump’s immediate predecessor, Barack Obama, whose Democratic administration has been endlessly berated by Trump, generally limits his rebuttals to attacks on Trump’s policies — never the man himself. And all five living ex-presidents partnered with Trump (who appeared via video feed) for a hurricane fundraiser just last month.

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