UK Prime Minister Keir Starmer has appointed Morgan McSweeney as his new Chief of Staff following the resignation of Sue Gray. McSweeney, a long-time political strategist, has been a key adviser to Starmer, playing a crucial role in shaping Labour's campaign strategy. His appointment comes as Starmer seeks to strengthen his leadership team ahead of the next general election, focusing on building a clear policy agenda and enhancing Labour's electoral prospects.