"It's in the book that he's got a pathological temper," Trump said on CNN’s "Erin Burnett OutFront," referring to Carson’s memoirs.

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"That's a big problem because you don't cure that,” he continued, adding: “As an example: child molesting. You don't cure these people. You don't cure a child molester. There's no cure for it. Pathological, there's no cure for that."

“I'm not bringing up anything that's not in his book. … When he says he's pathological — and he says that in the book, I don't say that — and again, I'm not saying anything, I'm not saying anything other than pathological is a very serious disease,” Trump added.

Carson’s 1990 book “Gifted Hands” growing up poor in Detroit. The retired neurosurgeon details a series of violent incidents in his youth, including attempting to stab a friend and attempting to attack his mother with a hammer.

Trump has repeatedly questioned Carson’s violent past, warning that his history makes him mentally unfit to be president.

Asked on CNN whether he feels Carson has left his anger behind, Trump replied, “I just don't know.”

“He's saying, ‘These things happen and therefore I have credibility.’ And what I'm saying is, I'd rather have them if they didn't happen. I don't want somebody who hit somebody in the face with a padlock.”

Trump attacked Carson last week, writing: “The Carson story is either a total fabrication or, if true, even worse-trying to hit mother over the head with a hammer or stabbing friend!”

Trump and Carson are neck-and-neck for the lead in the GOP presidential primary.