He is the first member of Congress caught up in the recent wave of allegations of sexual abuse and inappropriate behavior.
Franken apologised, but the criticism only grew through the day. Fellow Democrats swiftly condemned his actions, mindful of the current climate as well as the prospect of political blowback.
Republicans, still forced to answer for the multiple allegations facing Alabama Senate candidate Roy Moore, joined in pressing for an investigation. Franken said he would welcome it.
Both had been performing for military personnel in Afghanistan two years before the one-time "Saturday Night Live" comedian was elected to the Senate.
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Tweeden said yesterday that before an earlier show Franken had persisted in rehearsing a kiss and "aggressively stuck his tongue in my mouth." Now, she said, "every time I hear his voice or see his face, I am angry." She's angry with herself, too, she said, for not speaking out at the time "but I didn't want to rock the boat."
The swift rebukes from both Republican and Democratic lawmakers suggest that momentum from the online #Metoo movement has begun to spur a culture shift on Capitol Hill, where current and former staffers say misogynistic and predatory behavior has long been an open secret.
In a statement Thursday, Franken apologized to Tweeden and his constituents while maintaining that he remembered the rehearsal differently. Tweeden said she accepted his apology. "Coming from the world of comedy, I've told and written a lot of jokes that I once thought were funny but later came to realize were just plain offensive," Franken wrote.