Exclusive: In an interview with The Independent, former foreign secretary James Cleverly sets out the reasons why ministers must have known Peter Mandelson had failed his security vetting Sign up to our free Brexit newsletter for our analysis of the continuing impact of Brexit on the UK Sign up to our free newsletter for the latest analysis on Brexit's impact Sign up to our free newsletter for the latest analysis on Brexit's impact Email * SIGN UP I would like to be emailed about offers, events