The man who was allegedly assaulted outside President Donald Trump's "Keep America Great" rally was protesting the president's visit and said he won't let the incident affect his activism.

Michael Alter, 61, of Hyde Park, was at a protest outside Thursday's rally. Alter said he and the man who allegedly attacked him were shouting back and forth about Trump.

Alter said he was not there with any group and that he was peacefully protesting when the incident occurred. He has been attending political rallies since high school.

He said he won't let Thursday night change his future attendance at protests or rallies.

"If anything, it'll increase it," Alter said. "You can't let things like this happen. You can't have people who are trying to exercise our freedoms and free speech be intimidated by a bunch of fascists and a bunch of thugs."

Alter went to the emergency room Thursday night and was told he didn't have a concussion. He said he is having trouble with the vision in his right eye.

Alter's lawyer, Michele Young, describes him as a "lifelong patriot." Young said Alter served for three years in active duty and five years in the army reserve. Alter has since worked for the postal service, she said.

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Young said she hopes this incident prevents similar attacks in the future.

"We can't become a country where you're afraid to speak out, afraid to assemble, afraid to protest," she said.

Video of the incident went viral on social media on Thursday. The video allegedly shows Dallas Frazier, 29, of Georgetown, Kentucky, getting out of a red pickup truck and approaching Alter after the argument.

Frazier puts his hands up in fists. Alter said he wasn't going to just stand there.

Frazier began punching Alter and seconds later was arrested by police, as can be seen in the video.

Frazier has been charged with assault. Ally Cox, Frazier's attorney, said he wasn't there for the Trump rally. She said the location of the incident was "unfortunate."