The younger Bush had earlier described Donald Trump's inauguration speech in March as "some weird s**t".
In this endearing, illuminating work, presidential historian Mark K. Updegrove tracks the two Bush presidents from their formative years through their post-presidencies and the failed presidential candidacy of Jeb Bush, derailing the Bush presidential dynasty.
This is the first time that both former presidents have spoken out publicly to disavow President Trump.
The interview took place in May 2016, while Trump was steamrolling his way through a packed field of Republican presidential hopefuls to the nomination. After Carter said Trump was being given a hard time by the media, the latter thanked him by tweeting his thanks for the "nice remarks ..."
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The book's author, Mark Updegrove, interviewed the Bushes previous year - long before Trump's inauguration - and found neither wanted to see what they described as a coarse, populist campaigner become president.
That statement inspired the title of an upcoming book about George H.W. Bush and George W. Bush. But, in fact, George W. Bush had had a lifetime of making bold decisions. It also highlights ideological divisions within the Republican Party.
According to the book, neither Bush voted for Trump, with the elder Bush saying he voted for Hillary Clinton. White House press secretary Sarah Huckabee Sanders told NBC News.
"No Democrat has criticized the war in Iraq with as much anger as Donald Trump", Brinkley said. "If they were interested in continuing decades of costly mistakes, another establishment politician more concerned with putting politics over people would have won".