On July 23, 2019, Boris Johnson resoundingly defeated rival Jeremy Hunt, to become the leader of the United Kingdom's (UK) Conservative Party and the country's 77th prime minister. The nation's highest government seat became vacant after Theresa May, who served the role from 2016 to 2019, tendered her resignation on June 7, 2019. The 62-year-old leader stepped down after failing to garner parliamentary support for her proposal to end the UK's four-decade-long economic and political partnership with the European Union (EU) with as little disruption as possible.