What happens if the UK's Starmer quits, or is challenged? (opens in new tab)

What happens if the UK's Starmer quits, or is challenged? ReutersWhat is happening with Keir Starmer’s leadership: at-a-glance BBCUK's Starmer defies calls to quit, says he's getting on with governing USA TodayLive updates: UK Prime Minister Keir Starmer faces growing calls to quit CNNOust me if you can: Britain’s Starmer challenges mutinous party NBC News