Labour MP Catherine West has issued an ultimatum to party Cabinet ministers, demanding they move against Prime Minister Keir Starmer by Monday or she will attempt to trigger a leadership challenge herself.

West, a backbench MP, told the BBC that if no leadership candidate emerges from the Cabinet by her self-imposed deadline, she will try to initiate a contest against the party leader.

The MP's threat comes amid ongoing tensions within the Labour Party, though the specific circumstances prompting her ultimatum were not detailed in available reports.

Under Labour Party rules, a leadership challenge requires significant parliamentary support to proceed. Any potential challenger would need backing from a substantial number of Labour MPs to mount a viable campaign against the sitting leader.

West's position as a backbencher means she would likely face significant procedural and political hurdles in launching a successful leadership bid without broader parliamentary support.

The ultimatum represents a notable public challenge to Starmer's leadership from within his own party, though it remains unclear whether West's threat will gain traction among other Labour MPs or Cabinet ministers.