In an interview with POLITICO, Wilson said he was present for the episode and that it took place in the late '90s.
Wilson declined to say specifically what Cain said or did to the woman, but that the CEO's actions made other individuals at the table uneasy.
"It was very uncomfortable," said the pollster, recalling that other individuals present asked Cain to stop.
Wilson said there were at least three other people at the gathering but wouldn't share the name of the woman for publication.
The Cain campaign didn't respond to an email asking if they had a comment on the incident.
"It was very uncomfortable," said the pollster,
Just what I thought. You can supply of full quote from Wilson saying that he was present.