Prime Minister Keir Starmer said he will not step down if a Labour Party leadership contest is triggered following a by-election victory.

The statement follows a win by Andy Burnham in the Makerfield constituency in northwest England on June 19, 2026 [1]. The result is seen as a catalyst for a formal challenge to Starmer's leadership of the party.

Speaking during a press briefing in London, Starmer addressed the potential for a leadership race. He said he is prepared to defend his position against any challenger who seeks to replace him as party leader.

"If there is a contest then yes I will run, I will stand," Starmer said [2]. "I've said repeatedly, I'm not going to walk away from that" [2].

Burnham's victory in Makerfield has cleared a political path for a direct challenge to the Prime Minister [1]. The internal tension within the Labour Party has intensified as the result of the by-election provides Burnham with renewed momentum.

Starmer said during the briefing, "I will not walk away" [3].

Political analysts note that the Prime Minister's refusal to concede without a fight sets the stage for a potentially divisive internal battle. The outcome of such a contest would determine the future direction of the UK government, and the Labour Party's policy platform.

"If there is a contest then yes I will run, I will stand."

The situation signals a period of instability within the UK's governing party. By refusing to step aside despite Burnham's electoral success, Starmer is opting for a high-stakes confrontation that could either solidify his mandate or lead to a formal change in leadership, potentially shifting the party's ideological center.