Keir Starmer, the former prime minister of the United Kingdom, announced on Tuesday that he will resign as a member of Parliament, ending his domestic political career. Starmer, who served as MP for Holborn and St. Pancras since 2015, stepped down shortly after losing the premiership in June, when Andy Burnham succeeded him as prime minister and Labour Party leader.

Starmer informed a local newspaper in his London constituency that it was time to “pass the baton” and focus on “other things,” specifically international affairs such as defense, security, trade, and technology. He also plans to continue work on combating violence against women and girls, a cause he has supported since before entering politics. He did not provide further details about his future roles but has been widely speculated to be considering a position on the international stage.

The decision marks a reversal from earlier statements that he intended to remain in Parliament until the next general election, which must be held by 2029. His resignation will trigger a by-election in Holborn and St. Pancras, a traditional Labour stronghold but now a contested seat due to shifting political dynamics.

Labour faces potential challenges from the Green Party, which has increased its presence in the local Camden borough council, becoming the official opposition. Zack Polanski, leader of the Green Party and a member of London’s elected assembly, has expressed interest in contesting the seat. The Greens have gained ground in the area amid public disillusionment with Starmer’s government, which suffered significant electoral setbacks earlier this year.

Labour, however, remains optimistic about retaining the seat. Recent polling suggests that while the Greens made gains earlier, their support has declined somewhat under Burnham’s leadership. Labour has already launched a rapid candidate selection process, with decisions expected soon. Notably, former foreign secretary David Miliband, who previously represented part of Starmer’s constituency, will not seek to return to Parliament.

Independent candidates may also influence the contest. Andrew Feinstein, a Corbynite independent who finished second to Starmer in 2024, has indicated a willingness to run, calling for progressive forces in the area to unite behind a candidate opposing Labour’s incumbent establishment.

Starmer’s tenure as Labour leader spanned from 2020 until earlier this year. He took over after the party’s heavy defeat in 2019 and led it back to power in 2024 with a substantial parliamentary majority. Despite this, Labour’s popularity fluctuated under his leadership, culminating in a string of election losses in May that precipitated his resignation.

Conservative Party chairman Kemi Badenoch expressed surprise at Starmer’s resignation but acknowledged his reasons, citing the difficult treatment he received from Labour colleagues after losing office.

Starmer thanked his local constituency party for its support throughout his political journey, noting the important role it played in transforming Labour’s fortunes. His departure as MP now opens a key political test for Burnham’s administration and the competitive landscape in one of London’s most closely watched electoral districts.