Cat Little, the permanent secretary at the Cabinet Office, is set to provide evidence to the Commons foreign affairs committee regarding the vetting of Peter Mandelson, who was appointed as ambassador to the US despite a recommendation from the UK Security Vetting (UKSV) officials against granting him security clearance. This controversy has led to significant political fallout, including the dismissal of Olly Robbins, the Foreign Office permanent secretary, who was criticized for not adhering to UKSV's advice. Robbins contends that the final decision on security clearance rested with the Foreign Office, which led to his decision to proceed despite the UKSV's warning. The hearings are expected to shed light on the complexities of the UK's security vetting processes, which are often shrouded in secrecy. As the situation unfolds, Keir Starmer, leader of the Labour Party, is facing mounting pressure and divisions within his cabinet regarding the scandal.