Bush: Trump is ‘a liar and a whiner’
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Jeb Bush swung hard at Donald TrumpDonald John TrumpDonald Trump and Joe Biden create different narratives for the election The hollowing out of the CDC Poll: Biden widens lead over Trump to 10 points MORE Monday morning, attacking the New Hampshire front-runner’s mockery of Sen. John McCainJohn Sidney McCainHow Obama just endorsed Trump Former Texas Rep. Sam Johnson dies at 89 Trump's needless nastiness and cruelty will catch up with him MORE (R-Ariz.) and his tenure as a prisoner of war. 

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Trump responded by needling his Republican primary rival over his campaign spending and positions on education and illegal immigration.

Bush’s harsh words for the outspoken billionaire come one day before Tuesday’s early voting primary in New Hampshire.

Trump leads the Republican field by 17 points there, according to the latest RealClearPolitics average of polls. Bush ranks fourth in the Granite State, trailing second-place contender Sen. Marco RubioMarco Antonio RubioSchumer to GOP: Cancel 'conspiracy hearings' on origins of Russia probe Trump administration designates B of PPP funds for community lenders The Memo: Trump's Scarborough tweets unsettle his allies MORE (R-Fla.) by about 5 percentage points.

Trump inspired outrage last year by ridiculing McCain’s military service during the Vietnam War at the 2015 Family Leadership Summit in Ames, Iowa.

“He was a war hero because he was captured,” Trump sarcastically told host Frank Luntz during the event on July 18, 2015. "I like people who weren’t captured.”

Trump additionally panned McCain’s unsuccessful GOP presidential campaign during the 2008 election cycle.

“He lost and he let us down,” he said, adding that he spent $1 million on the senator’s failed Oval Office bid. "I’ve never liked him as much after that. I don’t like losers.”

McCain earned Trump’s ire by calling the business mogul’s supports the “crazies” of the right-wind movement last summer. Trump’s counterpunch inspired widespread condemnation given McCain spent six years as prisoner of war during the Vietnam conflict.