Shortly after Tweeden came forward, Franken issued an apology that said, "I respect women".
The Minnesota senator quit just a day after new allegations brought the number of women alleging misconduct by him to at least eight. She said she was gathering her belongings to follow her boss out of the room.
In remarks on the Senate floor, Franken said he was "shocked" and "upset" by the allegations against him, but "all women deserve to be heard and their experiences taken seriously".
"I, of all people, am aware that there is some irony in the fact that I am leaving while a man who has bragged on tape about his history of sexual assault sits in the Oval Office, and a man who has repeatedly preyed on young girls campaigns for the Senate with the full support of his party", Franken said, seconds after announcing his resignation.
He nevertheless called some of the allegations "not true", and that he was prepared to cooperate with an ethics investigation. "Others I remember very different". "But I know who I really am". He drew attention to the continued Republican support of the president, as well as Alabama Senate candidate Roy Moore.
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Politico reported that Dayton was expected to appoint Lt. Governor Tina Smith to the position if Franken resigned.
The victor of a special election in November 2018 would serve through to the end of Mr Franken's term in January of 2021.
Franken directly addressed the #MeToo movement in his resignation speech.
But they had lost patience with the growing tally of allegations and paved the path for Mr Franken's exit.
"Enough is enough", Senator Kirsten Gillibrand said.
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He has helped his teams become bowl-eligible in four of those seasons, including three straight between South Florida and Oregon. In Taggart's lone season he led the Ducks to a 7-5 record overall and berth in the Las Vegas Bowl.
It marked a dramatic and sudden show of unity against one of their own in the 100-member chamber, where the Republicans hold a slim majority. In the span of a few hours Wednesday afternoon, dozens of senators said Franken should go - including Schumer. "It's time for him to step aside". Cory Gardner, who is running the GOP's Senate election efforts, said. Franken of sexual misconduct in a piece published by The Atlantic.
Franken had been popular on the Democratic Party fundraising circuit until the sexual misconduct allegations arose.
The first allegation against Franken - for which he has apologized - was made by sports broadcaster and former model Leeann Tweeden, who said he forcibly kissed her, and touched her without consent as she slept, during a 2006 tour entertaining U.S. troops deployed in Afghanistan.
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