The first Johnson ministry began on 24 July 2019 when Queen Elizabeth II invited Boris Johnson to form a new administration, following the resignation of the predecessor Prime Minister Theresa May. May had resigned as Leader of the Conservative Party on 7 June 2019; Johnson was elected as her successor on 23 July 2019. The Johnson ministry was formed from the 57th Parliament of the United Kingdom, as a Conservative minority government. It lost its working majority on 3 September 2019 when Tory MP Dr Phillip Lee crossed the floor to the Liberal Democrats. An election was called for 12 December 2019, which led to the formation of a Conservative majority government, the second Johnson ministry.