Under Maine law, Platner has just one week — until next Monday — to remove his name from the ballot. The state Democratic Party would then have two weeks to choose a replacement, an unthinkable proposition just days ago.

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Platner has overcome past controversies, including reports of infidelity and “toxic” behavior with previous romantic partners. But the latest allegation, published by Politico, has pierced his seeming immunity from political fallout.

Senior lawmakers and outside groups began to pull their endorsements by Monday afternoon, while the Democratic Party apparatus appeared to pause digital fundraising that mentions him. Most prominently, the Maine Democratic Party called on him to withdraw from the race, followed by a warning from Senate Minority Leader Chuck Schumer (D-NY).

He promised in a joint statement with Sen. Kirsten Gillibrand (D-NY), the chairwoman of the Democratic Senatorial Campaign Committee, that Senate Democrats would not invest resources in Maine if Platner is the nominee.

“Graham Platner needs to immediately withdraw as the Democratic nominee for Senate and allow Maine Democrats the opportunity to choose a new candidate who can defeat Susan Collins,” Schumer and Gillibrand said.

Should Platner step aside, it would represent a rare do-over for national party leaders who were never comfortable with his lightly vetted campaign and publicly backed Gov. Janet Mills (D-ME) until she dropped out of the primary in April.

Platner ultimately won the Democratic nomination in June, prompting a lukewarm endorsement from Schumer. His victory was interpreted as part of a broader wave of success by left-wing populists who have promised to take on the political establishment if sent to Washington.

Polls showed him in a dead heat against Collins, although Democrats continued to express doubt about his viability with general election voters.

The Mills camp teased that she’d be willing to revive her candidacy the last time a bombshell report came out, and she still represents the kind of candidate whose pragmatic streak and record of winning statewide are appealing to Democrats. A spokesman for Mills did not respond to a request for comment.

Other contenders who have been floated include several of the unsuccessful candidates in last month’s Democratic primary for Maine governor. Those include Nirav Shah, a former public health official; Troy Jackson, a former state senator; and Shenna Bellows, Maine’s secretary of state. Each earned more than 20% of the primary vote in June.

Collins, for her part, is staying out of the fray as Platner navigates the political firestorm. Some of Platner’s most public supporters, including Rep. Ro Khanna (D-CA) and Sen. Ruben Gallego (D-AZ), rescinded their endorsements on Monday afternoon.

“These allegations are appalling,” Collins said in a statement. “Nevertheless, it is not up to me to choose the Democratic nominee for Senate.”

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The allegations come the same day a Wedgewood poll showed Platner 4 points behind Collins. Mills polled 50-50 against the Republican, while Jackson was the only of the three Democrats polled who was ahead. He led Collins by 5 points, 48%-43%.

Jackson was backed in the governor’s race by Sen. Bernie Sanders (I-VT), the Vermont socialist who stood by Platner despite the scandals surrounding him. He also had the support of the Maine chapter of the Democratic Socialists of America.