Move comes after PM insisted he would prove his doubters wrong and fight any leadership challenge

UK politics live – latest updates

More than 60 MPs have called on Keir Starmer to set a timetable to depart as prime minister, including backers of his leadership rivals Andy Burnham and Wes Streeting.

MPs from across the party’s ranks said the prime minister had failed to convince them he had what it took to lead the country into the next election.

In a speech earlier on Monday, Starmer said he would not resign and would prove his doubters wrong, saying Labour was facing “very dangerous opponents” in Reform UK. He said he would fight any leadership challenge and would not walk away from his responsibilities as prime minister.