British Prime Minister Keir Starmer is facing one of his toughest weeks in office after senior Labour figure and diplomat Lord Peter Mandelson resigned following revelations of his past connection with convicted sex offender Jeffrey Epstein. Mandelson, appointed by Starmer as ambassador to Washington, announced his departure from both his post and the Labour Party after new details emerged in the Epstein files, saying he wanted to avoid further embarrassment for the party.

The resignation has intensified internal unrest within Labour, with some members reportedly considering a leadership change. Starmer, who led Labour to a landslide victory in July 2024 promising stability after years of Conservative turmoil, has seen his popularity decline. Party rules make it difficult to remove a sitting leader quickly, but discussions are ongoing about possible mechanisms such as a confidence vote or coordinated pressure from senior figures.

Upcoming by-elections and local polls in Scotland, Wales, and England are seen as key tests for Starmer’s leadership. Poor results could heighten calls for his resignation, though potential challengers Wes Streeting and Angela Rayner are not yet ready to contest his position.