The lawmaker, Derrick Evans, posted the video to his Facebook page, where he goes by “Derrick Evans – The Activist” on Wednesday afternoon, but he later deleted it.

Mr. Evans, who was elected as a Republican state delegate in November, posted several videos from the events of the day, both narrating and joining in “Stop the Steal” chants with throngs of other Trump supporters. In the video that was deleted, he is among a crowd that shoved up against a door at the Capitol’s east front, some chanting and others loudly singing the national anthem. Those at the front appear to be trying to get inside, while Mr. Evans gives a running commentary on the attempts.

“We’re going in,” he says, at one point turning the camera to show himself wearing a helmet.

Suddenly the crowd moves quickly and the crowd rushes in, one woman screaming “We did it!” and Mr. Evans shouting “Derrick Evans is in the Capitol!”