How Andy Burnham Could Become Britain’s Next Prime Minister — And What Could Stop Him

Britain may be poised for another leadership shock. Less than two years after winning a landslide general election, Prime Minister Keir Starmer is facing a sustained rebellion from within his own party, while a high-profile rival looks set to return to Westminster.

Political Turmoil at Westminster

Nearly 100 Labour MPs have publicly called for Starmer to step down, and his defence secretary resigned on Thursday — a move that has raised questions about the government's credibility on defence spending and its ability to reassure the armed forces.

Andy Burnham’s Potential Return

Andy Burnham, the popular mayor of Greater Manchester, is poised to contest the Makerfield by-election on June 18. If he wins, he would take a seat in Parliament and immediately become eligible to stand in any Labour leadership contest — and therefore to mount a bid for 10 Downing Street.

Paths To No. 10 — And The Roadblocks

POLITICO has mapped how Burnham — or another challenger — could press a leadership challenge, including the sequence of securing a parliamentary seat, winning support among Labour MPs and party members, and triggering a formal leadership contest. At the same time, several obstacles could keep Starmer in post: internal party procedures, last-minute deals, negotiations with key factions, or a failure by challengers to consolidate support.

What To Watch: the Makerfield result on June 18; the size and cohesion of the faction calling for Starmer’s resignation; and who among Labour’s senior figures lines up behind any challenger.

This is a developing story with major implications for the government’s domestic and defence agenda. If Makerfield produces a high-profile new MP, the mechanics of Labour’s leadership rules and the balance of support in Westminster will determine whether that person can convert momentum into a successful challenge for the premiership.