Exclusive: Opinions split on ‘unprecedented’ release of files, despite demand for ‘all papers’ related to ex-US ambassador’s appointment

Guardian investigation uncovers decision by UK security officials to deny clearance before Mandelson took up role as US ambassador

Ministers and civil servants face scrutiny after revelation Foreign Office overruled vetting procedure for US ambassador appointment

Exclusive: Opinions split on ‘unprecedented’ release of files, despite demand for ‘all papers’ related to ex-US ambassador’s appointment

PM faces calls to resign as government says he was ‘not aware’ Foreign Office overruled disgraced Labour peer’s vetting ‘until this week’