Donald Trump on Ben Carson: He hit his mother with a hammer, that's pathological and something very strange here

Donald Trump is pouncing on Ben Carson. It will be interesting to see how Carson responds.

"I never hit my mother over the head, and you didn't either, Bill.

"When you suffer from a pathological disease, you're not really getting better unless you start taking pills or something.

"Do you think that's the right temperament to be president? I don't think so.

"There's something very strange here, something very strange is going on," Trump told Bill O'Reilly.