Sen. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.) is expected to resign from office Thursday, one day after his Democratic colleagues turned decisively against him over allegations of groping and other sexual misconduct.

In a dizzying turn of events, more than 30 Democratic senators called for Franken to step down after a new woman came forward to allege that he had forcibly tried to kiss her.

Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) opened the floodgates around noon, becoming the first senator to call for him to quit; others followed in rapid succession, effectively ending Franken’s political career in the span of a few hours.

Franken kept a low profile, skipping Senate votes, but his office said he would make a statement on Thursday. A Democratic official told Minnesota Public Radio he will be resigning from office, though his office insisted a decision had not been made.

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It’s a stunning fall for Franken, a former “Saturday Night Live” writer and author who, just a few weeks ago, was considered by many to be a dark horse for his party’s presidential nomination in 2020.

The first allegations against Franken emerged in mid-November, when Leeann Tweeden, a radio host, said he had kissed and groped her without her consent during a USO tour in 2006. She published a photo of Franken appearing to grab her breasts while she was asleep.

Several women came forward in the weeks after that to allege that Franken had groped or kissed them against their will, but Senate Democrats refused to call for Franken’s ouster, repeatedly stating that an Ethics Committee investigation should be allowed to run its course.

That changed Wednesday, when seven female Democratic senators called for Franken to step aside.

“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 said in a message posted on Facebook.

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By the end of the day more than half of the Democratic caucus — ranging from members of leadership to red-state senators to progressives and 2020 hopefuls — had said it was time for Franken to go.

“[We’ve] just seen that the charges, credible charges, continued to keep coming, and I thought it might have been an isolated incident or two, but it seems to be that there was a pattern of conduct,” Sen. Dick Durbin Richard (Dick) Joseph DurbinTumultuous court battle upends fight for Senate McConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden MORE (Ill.), the No. 2 Senate Democrat, told reporters.

Murray added that the latest allegations showed that “this is a persistent pattern and needs to be addressed.”

The breaking point for Senate Democrats came when Politico published a story where a former congressional aide said Franken tried to forcibly kiss her in 2006. He called the alleged incident “categorically not true.”

Though Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) didn’t publicly call for Franken’s resignation until Wednesday evening, a person familiar with their discussions said he called Franken immediately after the Politico story published, before the resignation calls started, to tell him he needed to step down.

Schumer also urged Franken to resign during a “series of phone calls” throughout Wednesday, the source said, and had a meeting with Franken and his wife at Schumer’s apartment.

A Democratic aide told The Hill that senators had been privately discussing what to do about Franken “for a while” before the latest allegations surfaced on Wednesday.

“This latest story certainly prompted continued conversations, and this morning members talked to each other about not waiting any longer to come out and call for him to resign,” the aide added.

And even as Democratic senators raced to distance themselves from Franken on Wednesday, new allegations continued to surface against him.

A former Democratic staffer wrote in The Atlantic that Franken groped her in 2009 while they posed to take a photo at a Media Matters inauguration celebration.

“He immediately put his hand on my waist, grabbing a handful of flesh. I froze. Then he squeezed. At least twice,” she wrote.

The push by Senate Democrats came after House members were increasingly vocal in stating that Franken should resign.

Former Rep. John Conyers John James ConyersBiden's immigration plan has serious problems Tlaib wins Michigan Democratic primary Tlaib holds lead in early vote count against primary challenger MORE Jr. (D-Mich.), who faced his own string of sexual harassment allegations, stepped down on Tuesday after coming under heavy pressure from his colleagues. Some of his allies in the Congressional Black Caucus appeared to question why Franken was still serving, calling it a double standard.

Senate Democrats were also facing charges of hypocrisy for not abandoning Franken, given their denunciations of Alabama GOP Senate candidate Roy Moore.

Moore is facing several allegations of sexual misconduct involving teenage girls when he was in his 30s; he has denied those allegations and refused to drop out of the race.

The former judge was endorsed by President Trump ahead of a special election on Tuesday and appears to have a good chance of winning the seat and coming to Washington.

Democrats downplayed suggestions that their criticism of Moore put pressure on them to demand Franken’s resignation.

“It’s not a partisan issue. Sexual harassment is wrong. Groping people, propositioning them, is unacceptable behavior,” said Sen. Tim Kaine Timothy (Tim) Michael KaineButtigieg stands in as Pence for Harris's debate practice Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D-Va.), who didn’t call for Franken to resign but said that he would give his advice to him privately.

Asked if Democrats are trying to seek the “moral high ground,” Durbin added: “I hope members of both parties will be guided by sound principles, even when it’s painful. And this is painful. Al Franken’s my friend.”

The Ethics Committee has already launched a “preliminary inquiry” into the allegations against Franken. If he doesn’t resign on Thursday, the panel could recommend a range of potential punishments, including a public reprimand or even expulsion.

The Senate last expelled a member — a move that requires the support of two-thirds of the chamber — in 1862 for supporting the Confederacy.

Franken’s resignation wouldn’t have an immediate impact on the Senate’s party breakdown.

Under state law Minnesota Gov. Mark Dayton (D) would appoint a candidate to serve until the 2018 elections, meaning the seat would likely stay in Democratic hands for at least the next 11 months.

Whoever wins the 2018 election would serve out the remainder of Franken’s term, which runs through 2020. A second election would be held in 2020 for a full six-year term.

Democratic Reps. Keith Ellison Keith Maurice EllisonOfficers in George Floyd's death appear in court, motion for separate trials Ex-Minneapolis officer involved in Floyd death asks judge to dismiss murder charge Over 50 current, former law enforcement professionals sign letter urging Congress to decriminalize marijuana MORE and Betty McCollum Betty Louise McCollumOVERNIGHT ENERGY: Trump extends Florida offshore drilling pause, expands it to Georgia, South Carolina | Democrats probe Park Service involvement in GOP convention | Sanders attacks 'corporate welfare' to coal industry included in relief package Democrats probe Park Service involvement in GOP convention Overnight Energy: EPA chief outlines vision for agency under 'Trump's second term' | Agency sued over decision not to regulate chemical linked to fetal brain damage MORE are both being floated as potential successors to Franken. Meanwhile, former Sen. Norm Coleman, a Republican who Franken defeated in 2008 by a few hundred votes, declined to rule out a potential bid on Wednesday.

“Never say never,” he told reporters on Capitol Hill.

Niv Elis and Alexander Bolton contributed.