Liz Truss has resigned as UK prime minister and leader of the Conservative Party after 45 days in office, making her the shortest-serving PM in UK history. Her resignation comes after a tumultuous period, including a chaotic night in the Commons and a failed economic plan. A contest to find the next Tory leader and PM has begun, with candidates needing the backing of 100 MPs by Monday. The new leader is expected to be in office by next Friday.