Franken is the latest person swept up in sexual harassment allegations that have mushroomed since Hollywood figure Harvey Weinstein was hit with multiple allegations.
Schumer's comments follow former model and current morning radio host Leeann Tweeden accusing Franken on Thursday of pressuring her to kiss him during a rehearsal for a 2006 USO Tour.
Upon returning to the USA, she recounted looking through photos and seeing an image of Franken appearing to grope her breasts.
The Senate's Democratic and Republican leaders called on the Ethics Committee to review the allegations and Franken said he would cooperate. Upon browsing through them she found one that appears to show Franken grinning a the camera, standing over Tweeden with his hands either hovering over, or grabbing her breasts. His office released a statement saying the photo was meant to be amusing, though he also offered his apologies.
The host, Leeann Tweeden also claimed he forcibly kissed her when they were performing together for troops overseas.
In her essay, Tweeden said she meant to participate in the comedy tour, hosted by the United Service Organizations, as an emcee.
Franken publicly apologized to Tweeden, but said he did not remember the kissing scene practice the same way she did.
Leeann Tweeden is now a morning news anchor on TalkRadio 790 KABC in Los Angeles and posted her story in a lengthy post on the station's website. But, she says, Franken insisted, and she eventually relented.
And, you know, she says that she wasn't aware of this until she looked through the photos and writes in her essay, I couldn't believe it.
"He had a chance to apologize to me then, because he knew - he knew exactly what he did to me then and that picture was out there", she said".
She said she hoped her allegations would prompt other women to share their own experiences.
Senate Majority Leader Mitch McConnell (R-KY) is now advocating for an ethics investigation into Franken.
"The allegations are serious, we need to take them seriously and I support an ethics investigation".
But on the day of the show, Tweeden wrote, she was alone with Franken backstage when he told her, "We need to rehearse the kiss". "While debating whether or not to go public, I even thought to myself, so much worse has happened to so many others, maybe my story isn't worth telling?" It isn't amusing. It's completely inappropriate.
"To say I was sorry for writing a joke was to sell out my career, to sell out who I'd been my entire life", Franken said. "I've had to live with this for 11 years", she said on-air. "I have let them down and am committed to making it up to them". "Regardless of party, harassment and assault are completely unacceptable - in the workplace or anywhere else", McConnell said in a statement.
Franken said in a statement that Tweeden's account of the skit did not match his memory.