Morgan McSweeney, the chief of staff to UK Prime Minister Keir Starmer, has resigned following the nomination of Peter Mandelson as the UK ambassador to the United States, a decision that has sparked controversy due to Mandelson's connections to the scandal surrounding Jeffrey Epstein. McSweeney publicly accepted responsibility for advising Starmer on this appointment, indicating that he believed it would strengthen the UK’s diplomatic ties but has since recognized the backlash as damaging to the political integrity of both the Labour Party and the government. In his resignation statement, McSweeney expressed regret over the nomination, asserting that it has harmed public trust in politics, highlighting the sensitive nature of political decisions regarding individuals with controversial pasts.