Trump said he doesn't condone violence.
"But I want to see. The man got carried away, he was 78 years old, he obviously loves his country, and maybe he doesn't like seeing what's happening to the country," Trump said.
NBC "Meet the Press" host Chuck Todd asked him to clarify if that meant he would pay for the legal fees.
"Well, I'm going to look at it. I'm going to see, you know, what was behind this because it was a strange event," Trump said. "I've actually instructed my people to look into it, yes."
John McGraw, 78, was arrested and charged last week with assault and battery and disorderly conduct after allegedly punching a protester in the face at a rally in North Carolina as the protester was being escorted out of the building.