US lawmakers investigating the Capitol riot have shown the video of a Republican giving a tour to a man who they say returned on the day of the attack.
The committee says Congressman Barry Loudermilk was seen with a group that includes a person who was among those outside Congress the next day.
The Georgia representative has called it a smear campaign by the committee.
He cited a letter from US Capitol Police saying there was nothing suspicious about his role in the tour.
Democrats have questioned whether some Republicans led any reconnaissance tours for visitors who later joined the raid on Congress as it met to certify President Joe Biden's election victory on 6 January 2021.