The incident happened during one of the 17 interruptions at the Trump campaign event in the Crown Coliseum.
Rakeem Jones was part of a group escorted out by deputies when they began protesting during Trump's speech.
As Jones walked up the stairs, a man with a ponytail and wearing a hat is clearly seen from several camera angles punching Jones in the face.
The deputies below Jones appear to be looking down when it happened, but another camera angle appears to show a deputy above looking directly at Jones and the man as he's punched.
Jones told the Washington Post he's upset deputies did not arrest the man who hit him.
"It's happening at all these rallies now and they're letting it ride," Jones said. "The police jumped on me like I was the one swinging." He added: "My eye still hurts. It's just shocking. The shock of it all is starting to set in. It's like this dude really hit me and they let him get away with it. I was basically in police custody and got hit."
Another protester who was with Jones also filmed the incident from his perspective. That video shows both men being escorted out of the building.
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