Prime Minister Keir Starmer of the United Kingdom has announced his resignation. Beset by poor polling and the election to Parliament of a leadership challenger, Andy Burnham, Starmer knew his time was up. Starmer will leave office on Sept. 1, following the Labour Party’s selection of a new leader and prime minister (in the U.K. system, the party with a majority in Parliament can select a new prime minister without needing to hold a new election). But with former leadership challenger Wes Streeting now having endorsed Burnham, it is near certain that Burnham will become the next prime minister.

What might the ascension of the former mayor of the northern English city of Manchester mean for the U.S.-U.K. special relationship?