Washington (CNN)Ben Carson on Saturday dismissed attacks from Donald Trump in which he accused the retired neurosurgeon of not having enough "energy" to be president.

"My energy levels are perfectly fine," Carson said in Iowa. "As I've said many times, there have been many times where I've operated 12, 15, 20 hours, and that requires a lot of energy. Doesn't require a lot of jumping up and down and screaming, but it does require a lot of concentration."

His comments came the day after Trump told a rally in Miami that Carson has even less energy than Jeb Bush, who he has repeatedly called a "low-energy" candidate.

"Ben Carson is super low energy, right? He's super low," Trump said. "Super low energy. We need tremendous energy. We need tremendous energy."
 

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