Bush: Trump is ‘a liar and a whiner’
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Jeb Bush swung hard at Donald TrumpDonald John TrumpScarborough mocks 'Deflection Don' over transgender troop ban Pelosi condemns Trump's 'cowardly, disgusting' ban on transgender troops Trump moves to ban most transgender people from serving in military MORE Monday morning, attacking the New Hampshire front-runner’s mockery of Sen. John McCainJohn Sidney McCainMcCain asks Trump's CIA pick to explain ties to torture Petraeus: Haspel will explain actions in nomination hearing Afghanistan is our longest war ever and Congress has abandoned all responsibility MORE (R-Ariz.) and his tenure as a prisoner of war. 

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 RubioRubio: 'Hyperventilating' about Bolton unfounded George Clooney writes Parkland students: 'You make me proud of my country again' Biden praises Parkland students fighting for gun reform: ‘They’re going to win’ 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.