UK's Starmer reportedly set to quit as Labour rival sworn in as MP

Embattled British Prime Minister Keir Starmer could set out plans to step down as soon as Monday, U.K. media has reported, the same day his likely successor is expected to be sworn in as an MP.

Veteran Labour politician Andy Burnham is due to take up his seat in the House of Commons, three days after clinching victory in a crunch by-election and clearing the path for an anticipated leadership challenge.

Under Labour's rules, the leader of the centre-left party must be a member of parliament.

If Starmer does leave office this year, Britain will get its seventh prime minister in a decade — an unprecedented rate of churn in its modern history.