Prime Minister Keir Starmer faces mounting pressure to resign following the government's admission that Peter Mandelson failed security vetting before his appointment as UK ambassador to the US, drawing sharp opposition criticism and calls for Starmer's departure over alleged misleading of Parliament. This scandal compounds Labour's woes ahead of May 7 local elections, where internal MRP polling from late March projects heavy losses—including every Sunderland seat to Reform UK and gains for Greens in London councils—signaling a potential "bloodbath" with no safe seats. No leadership contest has been scheduled, requiring Starmer's resignation or National Executive Committee action under party rules empowering MPs, members, and union affiliates; speculation swirls around contenders like Angela Rayner, Wes Streeting, Yvette Cooper, and Andy Burnham, but rapid fallout from election results could trigger nominations by summer.