Kingmaker Mamdani calls on Platner to 'drop out of the race' after rape allegation

When further pressed on whether Platner's campaign would have an impact on the broader progressive movement, Mamdani declined to weigh in.

"I think the focus of today should be on the campaign coming to a close, and I think there will be many more days to have conversations about what it means beyond that," he said.

Platner so far has not announced an end to his campaign, but said in a video statement moments after the report dropped that he was "taking the time to reflect on the best path forward for the state that I love, the people that I love, the movement I belong to and the goal of defeating Susan Collins."

Several progressive candidates running for Senate, who previously kept mum on Platner's scandals, have demanded he pull the plug on his campaign. Those include James Talarico in Texas and Abdul El-Sayed in Michigan.

And on Tuesday afternoon, Platner lost his biggest backer.