The prime minister did not know Lord Mandelson failed security vetting for the role of US ambassador until earlier this week, the government has said. A spokesperson said the decision to go against the recommendation of the vetting agency and allow him to take up the role was taken by officials in the Foreign Office. Sir Keir Starmer has faced calls to resign over allegations he misled Parliament and MPs when he claimed "full due process" was followed during the appointment. It came after the Guardian newspaper reported, external that Lord Mandelson was initially denied security clearance in late January...