The woman's story is backed up by two other (also unnamed) sources, who say she told them of her experience with Franken years before the other allegations surfaced.
Another sexual harassment accusation against U.S. Sen.
At least six women have come forward in recent weeks alleging Franken forcibly kissed them or groped them in the past.
The former staffer ducked to avoid Franken's lips.
The woman, who Politico describes as a "longtime Democrat", said she did not come forward to force Franken out of office, but only to "encourage the former comedian to acknowledge that his behavior towards her and other women was intentional".
Morgan Chalfant, reporter for The Hill, weighs in on allegations against the embattled Democratic senator from Minnesota. "It was very quick and I think my brain had to work really hard to be like 'Wait, what is happening?' But I knew whatever was happening was not right and I ducked", the aide said in an interview.
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She said she was gathering her belongings to follow her boss out of the room, the Politico report continued, and she turned around to find Franken in her face. One of the colleagues confirmed that the woman told her about the incident right after it happened, including the entertainer line. The second said she was made aware of the encounter sometime in 2009 or 2010.
Franken, in his statement, said the idea he would claim such conduct as a right as an entertainer was "preposterous".
Unlike in other accusations involving Franken where he has apologized, he is vehemently denying these claims and has implied the woman is a liar.
"While Senator Franken is entitled to have the Ethics Committee conclude its review, I believe it would be better for our country if he sent a clear message that any kind of mistreatment of women in our society isn't acceptable by stepping aside to let someone else serve", Gillibrand, a New York Democrat, wrote in a lengthy Facebook post.
As Franken himself noted, he is under investigation by the Senate ethics committee for allegedly groping and sexually harassing several women, including sports commentator Leeann Tweeden.