Claim: The Baroness Brinton, a British Liberal Democrat politician who served as Leader of the Liberal Democrats, took office on July 22, 2019 and left office on December 13, 2019.
Evidence: Jo Swinson lost her seat in the general election held on 12 December 2019, thus ceasing to be leader; deputy leader Ed Davey and Party President Sal Brinton became acting co-leaders. Brinton was replaced by Mark Pack following his assuming the office of Party President on 1 January 2020.