Liz Truss resigns - and will become shortest-serving prime minister in British historyLiz Truss succeeded Boris Johnson as prime minister on 6 September after defeating Rishi Sunak in the Conservative Party leadership contest and meeting the Queen at Balmoral.Sunak favourite to be new PM as Truss resigns - live politics updatesShe said she was elected "with a mandate to change this", adding: "We delivered on energy bills."Sky News understands Commons leader Ms Mordaunt and Justice Secretary Brandon Lewis are taking soundings from Tory MPs over whether to put their hats in the ring.Mr Hunt, who voted for Rishi Sunak during the leadership campaign, then took over as chancellor and U-turned on the majority of the unfunded mini-budget tax cuts on Monday - further undercutting Ms Truss's authority.On Wednesday afternoon, her home secretary, Suella Braverman, then quit after saying she had breached security rules by sending a policy message to a colleague over her personal email by mistake."