Today, pressure is mounting on the PM as Wes Streeting resigned from his role as health secretary, and Josh Simons announced he would stand aside for Andy Burnham to have his seat.
There are still some steps ahead before that happens. The National Executive Committee must select him as the candidate, and he would need to go ahead and win. Nonetheless, the party is in chaos and Starmer is facing the biggest rebellion against his premiership to date.
What happens now and if there is to be a leadership election, when will it be? Adam, Chris, Alex and Joe unpack the (many) events of the day.
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Newscast brings you daily analysis of the latest political news stories from the BBC. The presenter was Adam Fleming. It was made by Anna Harris with Shiler Mahmoudi and Joe Wilkinson. The social producer was Beth Pritchard. The technical producer was Philip Bull. The assistant editor is Chris Gray. The senior news editor is Sam Bonham.