The woman, who was not named in the report by CNN, said she attending a fundraiser for Bush's 1992 re-election campaign when the president touched her buttocks.
"We got closer together for a family photo and it was like, 'Holy crap!'" she told CNN. "It was like a gentle squeeze."
While she thought at the time that it may have been an accident, recent reports from other women about similar behavior from Bush, now 92, made her reconsider the incident.