Key facts
- Andy Burnham won the Makerfield by-election on June 19, 2026, with 55 percent of the vote.
- Burnham's victory positions him to challenge Keir Starmer for the Labour Party leadership.
- Burnham's allies are plotting to launch a campaign for No. 10, while Starmer's allies are preparing to defend his position.
- Rival Wes Streeting also claims to have sufficient MP backers for a leadership challenge.
- Some Cabinet ministers are reportedly considering resigning to pressure Starmer to set a timetable for his exit.
- Burnham's preferred timeline for a leadership transition is September, to allow time for policy development and a party conference speech.
Andy Burnham has secured victory in the Makerfield by-election, a win that now propels him into a direct challenge for the leadership of the Labour Party against incumbent Keir Starmer. Burnham, who previously served in Westminster before becoming Mayor of Greater Manchester, won the seat with 55 percent of the vote, significantly outpacing Nigel Farage's Reform UK.
Burnham's campaign, which has been deliberately positive and somewhat guarded on specific timelines and plans, is now set to pivot to a full-fledged leadership bid. His allies are reportedly working behind the scenes to prepare for a contest, while Starmer and his supporters are gearing up to exploit any perceived weaknesses in Burnham's platform and strategy. The two leaders have not spoken during the by-election campaign, despite official mandates for MPs to support Burnham's return to Parliament.
Burnham is expected to attempt to persuade Starmer to step aside voluntarily, rather than initiating an immediate formal challenge within the first 72 hours of his by-election win. However, if Starmer resists, both Burnham and another rival, Wes Streeting, are prepared to launch formal challenges. Streeting claims to have the necessary 80 MP backers required by party rules, though Starmer's camp believes this is a bluff. The situation is creating significant internal pressure, with some Cabinet ministers reportedly considering resignations to force Starmer's hand.
Burnham's preferred timeline for a leadership transition is September, allowing him time to develop policies and prepare for the Labour Party conference. However, some of his advisors are pushing for a faster move. A full leadership contest is estimated to take around two months, and Burnham's team wants it to commence by early July to conclude before the parliamentary summer break. The potential for a contest, or a swift handover, is a major point of contention, with concerns that a protracted or acrimonious battle could damage the party's standing, particularly with Reform UK leading in national opinion polls.