On 28 August 2019, the Parliament of the United Kingdom was ordered to be prorogued by Queen Elizabeth II on the advice of the Conservative prime minister, Boris Johnson – advice which was later ruled unlawful. The prorogation, or suspension, of Parliament was to be effective from some point between 9 and 12 September 2019 and would last until the State Opening of Parliament on 14 October 2019. As a consequence, Parliament was suspended between 10 September and 24 September 2019. Since Parliament was to be prorogued for five weeks and reconvene just 17 days before the United Kingdom's scheduled departure from the European Union on 31 October 2019, the move was seen by many opposition politicians and political commentators as a controversial and unconstitutional attempt by the prime minister to avoid parliamentary scrutiny of the Government's Brexit plans in the final weeks leading up to Brexit. Johnson and his Government defended the prorogation of Parliament as a routine political process that ordinarily follows the selection of a new prime minister and would allow the Government to refocus on a legislative agenda.

Alexander Boris de Pfeffel Johnson is a British politician and writer who was Prime Minister of the United Kingdom and Leader of the Conservative Party from 2019 to 2022. He was previously Foreign Secretary from 2016 to 2018 and Mayor of London from 2008 to 2016. He was Member of Parliament (MP) for Henley from 2001 to 2008 and Uxbridge and South Ruislip from 2015 to 2023.