British Prime Minister Keir Starmer announced his resignation as Labour Party leader and Prime Minister on Monday, June 22, 2026. His resignation marks the end of his 23-month tenure as Prime Minister, a period that began in July 2024 when he led Labour to a landslide victory, winning 411 of 650 seats in Parliament, according to the Independent. The announcement coincided with high temperatures across the country.

The resignation was triggered by local election losses and internal party dissent, specifically a by-election victory for Andy Burnham in Makerfield. According to CNN, Starmer's departure comes approximately 10 years after the UK voted to leave the European Union. During his time in office, Starmer was known for his support of Ukraine and efforts towards a new EU-UK defense partnership, as reported by DW.

Wes Streeting has backed Andy Burnham's leadership bid and ruled himself out of the contest. According to the Independent, Andy Burnham was sworn in as an MP on Monday, June 22, 2026, and is expected to replace Starmer as Labour leader. However, AP News reports that Keir Starmer will remain Prime Minister until a successor is chosen.

The resignation represents a period of political instability related to policy and unity issues. Accounts differ on the broader implications, but the event is characterized by significant losses for the Labour Party and criticism regarding Starmer's strategic direction.