PM's ex-chief of staff to give evidence on Mandelson vetting 24 minutes ago Kate Whannel Political reporter Getty Images The prime minister's former chief of staff Morgan McSweeney will give evidence to MPs on the Foreign Affairs Committee next week about his role in the security vetting of Lord Mandelson. McSweeney, who advised the prime minister to appoint Lord Mandelson as the UK's ambassador to the US, is likely to face questions about whether he put pressure on civil servants to speed up the vetting. It comes after former senior Foreign Office civil servant Sir Olly Robbins accused No 10 of a "dismissive" attitude towards the process - a claim Downing Street has denied. Cat Little, the most senior civil servant at the Cabinet Office, will appear before the committee on Thursday. Last week, Little told Sir Keir Starmer that the UK Security and Vetting (UKSV) team had raised concerns about Lord Mandelson, but the Foreign Office had still granted him security clearance.…