Britain holds a crucial by-election today. The vote could trigger a leadership challenge against Labour's Keir Starmer. Andy Burnham, a popular mayor, aims to win the seat to run for party leader. If he wins, Starmer's position becomes precarious. The outcome rests with voters in the Makerfield constituency. A result is expected early Friday.

Britain holds a crucial by-election today. The vote could trigger a leadership challenge against Labour's Keir Starmer. Andy Burnham, a popular mayor, aims to win the seat to run…

Britain holds a special vote on Thursday that is expected to set in motion an attempt to oust Labour leader Keir Starmer as prime minister.