Is Trump ready to attack Carson?

As Ben Carson inches closer to him in the polls, Republican presidential front-runner Donald Trump says he is ready to take on the retired neurosurgeon in the same way he's pounced on other candidates.

The outspoken businessman said Wednesday he "can't really explain" Carson's recent surge to second place in the GOP field, but thinks it has something to do with the attention Carson received for comments he made about not supporting a Muslim as president of the U.S.

"He's been getting a lot of ink on the Muslims and other things and I guess people look at that and they probably like it," Trump told "Good Morning America's" George Stephanopoulos.

If Carson continues to get "ink," Trump hinted that he could soon axe his friendship with the fellow outsider candidate, whom he described as a "good guy" earlier in the interview.

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