Following Keir Starmer’s resignation as UK prime minister, King Charles welcomes the next prime minister at Buckingham Palace as part of the constitutional process. The king’s role is ceremonial and procedural: he meets the incoming prime minister to formally appoint them after the political leadership in Parliament changes. Reporting notes that the next appointment will be the fourth prime minister of King Charles’s reign. That sequence includes Liz Truss, Rishi Sunak, and Sir Keir Starmer, before the newly appointed prime minister. The transition occurs as the UK’s government reshapes following Starmer’s departure from office. While the prime minister’s resignation reflects decisions within the elected government and parliamentary leadership, the monarch’s involvement centers on receiving and formally recognizing the new head of government. Across coverage, the focus is on the continuity of the monarchy’s constitutional function during changes in the prime ministership.