Menz said in 2010 she went to the Minnesota State Fair with her husband and father and met various officials and celebrities while there, as her father's business was sponsoring a local radio booth.
Franken came by, she said, "pulled me in really close, like awkward close, and as my husband took the picture, he put his hand full-fledged on my rear".
"It wasn't around my waist". It wasn't around my hip or side. "It was definitely on my butt", she told CNN, recalling that the brazen act lasted three or four seconds.
"I was like, oh my God, what's happening".
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.
The 66-year-old former comic apologized to Menz if he made her feel "disrespected". Check back later for updates.
Lindsay Menz, 33, who now lives in Frisco, Texas, told CNN in a programme broadcast on Monday that she felt "gross" at the time and immediately told her husband, Xinhua news agency reported.
The show's female staff released a letter today, saying that even though Franken's behavior towards KABC's Leeann Tweeden was "stupid and foolish", they feel compelled to defend his public service record and his conduct from when he used to work with him.
Franken's statements have been contrite.
Menz also said she posted the photo with Franken on Facebook on August 27, and when her sister commented on the photo, she replied: "Dude - Al Franken TOTALLY molested me!" And she had evidence - a photo that had been taken by a photographer of Franken with his fingers splayed, grabbing her chest through her clothes as she slept, and smiling wickedly back at the camera. "In our experience, we know Al as a devoted and dedicated family man, a wonderful comedic performer, and an honorable public servant", it continued. "There's no excuse", he said.
Franken has been regarded as a potential Democratic contender for president in 2020.
Tweeden described the allegations in a story as unwanted, forcible sexual advances. The couple voted previous year for Donald Trump, and Menz said she has voted for Minnesota Sen.
"The Al Frankenstein picture is really bad, speaks a thousand words", Trump Tweeted, referring to a picture of Franken groping or pretending to be groping a sleeping Tweeden. Kellyanne Conway, a counselor to the president, suggested on Monday that despite the allegations facing Moore, his vote would be necessary for Republicans to pass tax reform.