(CNN) Donald Trump seemed to walk back his promise to pay the legal fees of supporters who are charged for violence at his rallies when pressed on the subject by ABC's "Good Morning America" on Tuesday.

"By paying those (legal) fees, wouldn't you be rewarding and encouraging violence?" asked host George Stephanopoulos.

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"No, no I didn't say that. I haven't looked at it yet, and nobody's asked me to pay for fees, and somebody asked me a question and I haven't even seen it, so I never said I was going to pay for fees," the Republican front-runner said, at first denying what he has said both during a campaign rally and on Sunday during an interview.

At a rally in February, Trump told his supporters about protesters: "Knock the crap out of them, would you? Seriously. OK? Just knock the hell -- I promise you, I will pay for the legal fees. I promise, I promise."

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