Former UK Prime Minister Keir Starmer announced on Tuesday his intention to abandon domestic politics to focus on international affairs. ^[1] Keir Starmer, former Prime Minister of the United Kingdom, announced on September 1, 2026, that he is resigning from his seat in the House of Commons. ^[2] Keir Starmer announced on Tuesday that he will resign his seat as the Member of Parliament for Holborn and St Pancras to focus on international affairs. ^[3] Zack Polanski, the leader of the Green Party, has stated that he will stand as a candidate in the byelection for the Holborn and St Pancras constituency. ^[4] Keir Starmer is resigning from the parliamentary seat he has held since 2015, becoming the first Labour leader to win a general election in nearly two decades to do so. ^[5] Keir Starmer is reversing his initial intention to remain in parliament until the next general elections, which are expected in 2029. ^[6] Starmer's resignation forces a by-election in his historically Labour stronghold constituency. ^[7] Keir Starmer represented the London constituency of Holborn and St. Pancras in the House of Commons for 11 years, having been elected in 2015. ^[8] Starmer stated to the Camden New Journal that it was the right time to step down and that he will now focus on international affairs, including defense, security, trade, and technology. ^[9] Keir Starmer became Prime Minister in July 2024 following a landslide victory for the Labour Party that ended 14 years of Conservative governments. ^[10] Starmer resigned his position as Prime Minister on June 22, 2026, after becoming unpopular in the country and within his party due to controversial decisions and local election defeats. ^[11] Starmer stated he will concentrate on international matters, specifically defense, security, trade, and technology, in a rapidly changing world. ^[12]