The 55-year-old MI woman, who asked that her name not be published, told CNN Thursday that the incident happened at a MI fundraiser during Bush's re-election campaign.
The woman asked not to be identified by name, but a picture of her and Bush was shared with CNN.
"We got closer together for a family photo and it was like 'Holy crap!'" she said, noting that Bush used the opportunity to squeeze her buttocks.
In the moment, the woman said, she just smiled for the camera.
The woman reminded CNN that this incident occurred in 1992, when he was 67 years old and still in fine health. This time, the alleged inappropriate incident occurred while he was in office.
South Carolina Women's Basketball Team Declines Donald Trump White House Invite
The White House had not announced by late Thursday which teams will be meeting with President Donald Trump. USC is 3-0 on the season and earned a 94-86 win at No. 15 Maryland earlier this week.
Once other accusers started piling up, however, she chose to come forward. Jordana Grolnick, an actress who alleged that Bush groped her behind past year as his wife, Barbara, stood nearby, told The Associated Press that she has no plans to report the 41st president to authorities.
Initially, the woman said that she thought it was perhaps an accident and brushed it off. Shook said that under Texas law, touching someone's buttocks over the person's clothing would most likely be grounds for a misdemeanor assault charge, with only a $500 fine and no jail time. "David Cop-a-feel", he replied, allegedly grabbing her rear end as she posed for a photo with Bush - who was in his wheelchair - and her husband.
"He didn't shake my hand", she said. She said: "It was unmistakable".
In response to the allegations reported last month, Bush spokesman Jim McGrath issued a statement citing the former president's age and physical condition.
A third woman who wished to remain anonymous told CNN in October that she met Bush at a VIP event in Houston in 2015.
"At age 93, President Bush has been confined to a wheelchair for roughly five years, so his arm falls on the lower waist of people with whom he takes pictures".
But both the MI woman and Corrigan said that when Bush groped them, they were both standing.