Trump teased Bush, a former Florida governor, for his recent decision to lay off campaign staff and cut salaries by 40 percent, and for his planned retreat with donors in Texas on Sunday.
"Bush has no money, he's meeting today with mommy and daddy, and they're working on his campaign," Trump said at the rally in downtown Jacksonville, Fla.
"He's a guy wants to run our country and he can't even run his own campaign. Think of it," he added.
The billionaire business mogul also tried to draw a contrast between Bush's campaign and his, saying he has fewer campaign staff and has spent the least money of all the candidates so far.
"You have all these people, what do you need these people for?" he said. "I put up less money than everyone else, and I'm number one."
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