Wes Streeting has officially resigned as Health Secretary today, May 14, 2026. As the Cabinet grapples with the fallout, many are questioning how a leadership challenge within the Labour Party would unfold.
What Triggers a Leadership Challenge?
MPs dissatisfied with Sir Keir Starmer remaining as Prime Minister can attempt to force an election for the Labour Party leadership. To initiate a challenge, 20 percent of Labour MPs must support an alternative candidate. With 403 Labour MPs, this means 81 MPs must back a replacement for the party leader.
How the Contest Proceeds
If a leadership election is triggered, other candidates can join the contest provided they also secure 81 supporters. The Prime Minister does not need to gather backers as he automatically appears on the ballot if he chooses to contest the challenge.
Labour Party members then vote via postal ballot. MPs rank candidates in order of preference. To win, a candidate must secure at least 50 percent of the votes. The lowest-scoring candidate is eliminated, and their supporters' second preferences are redistributed until one candidate reaches the 50 percent threshold and is declared the winner.
Historical Context
No sitting Labour Prime Minister has ever faced a formal leadership challenge from their party's MPs. The current speculation follows Wes Streeting's resignation, which many view as a precursor to a leadership bid. In his resignation letter to the Prime Minister, Streeting stated he had "lost confidence" in Starmer's leadership and deemed it "dishonourable" to continue serving in the Cabinet.
As rumours swirl, the political landscape remains tense, with all eyes on whether the required 81 MPs will step forward to back a challenger.
