The ethics committee of the Senate has been called to open a internal investigation preliminary by the head of the Senate and Al Franken himself.
Franken, who had been elected to the Senate two years prior, was attending the Minnesota State Fair when he posed for a photo with Lindsay Menz, now 33, who was there to support her father's small business.
Menz's allegations come days after Franken apologised to U.S. TV personality Leeann Tweeden after she accused him of kissing and groping her during a USO (United Service Organization) tour in 2006.
The woman alleges that Franken groped her as the two posed for a photo in 2010.
CNN reports that immediately after the picture of Menz and Franken at the state fair was posted to Facebook, Menz commented, saying, "Dude - Al Franken TOTALLY molested me!" It was definitely on my butt ...
Although she and her husband voted for Donald Trump in November, Menz said neither is registered with a political party and have voted for both Democrats and Republicans in the past. I felt gross. It'd be like being walking through the mall and some random person grabbing your butt ...
Menz, who now lives in Frisco, Texas, shared her claims with CNN on Thursday, just hours after Tweeden's story first broke.
"I take thousands of photos at the state fair surrounded by hundreds of people, and I certainly don't remember taking this picture", said Franken in a statement. You just feel gross. "Like ew, I want to wash that off of me", Menz said.
Franken's office says that the senator has no recollection about his interaction with Menz, but it said that he felt sorry that she came away from their interaction feeling disrespected. According to Lindsay and her husband Jeremy, Franken pulled Lindsay close for the picture.
"I respect women. I don't respect men who don't", he added. "He was already gone and I wasn't going to confront him".
Menz reached out to CNN with her story shortly after Tweeden's allegations became public. "But yeah - I was in shock, really".
In the photo of Menz and Franken, the lower halves of their bodies are not shown.
According to the statutes of Minnesota, "intentional touching of the clothing covering the immediate area of the buttocks" is not considered criminal sexual conduct. He said of his own interaction: "As a matter of practice, I did that all the time".