Liz Truss throws in the towel after 44 days🥬 #liztruss #borisjohnson Liz Truss Announces Resignation as U.K. Prime Minister. U.K. Prime Minister Liz Truss announced her resignation in a speech outside Downing Street after less than two months in office. Truss faced the lowest approval rating of any British leader in decades after her economic policies caused turmoil in financial markets. Boris Johnson is expected to run for the role again.