Keir Starmer has thrown down the gauntlet to his potential rivals, defying calls to quit as Britain’s prime minister and instead challenging his would-be opponents to launch a formal challenge against his leadership of the Labour Party.

Keir Starmer is 48 hours away from a challenge for his leadership, after an Aussie said she would run to topple the UK Prime Minister if no one else stepped forward.

Sir Keir Starmer has vowed to fight on despite growing calls for him stand down from his own MPs and the threat of a leadership contest.