Peter Mandelson's appointment as the US ambassador is under scrutiny after he reportedly failed crucial security vetting. The Foreign Office overruled the recommendation to deny him clearance, raising questions about transparency and the Prime Minister's knowledge of the situation.

• 01Peter Mandelson's appointment as US ambassador is controversial due to failed security vetting.
• 02Olly Robbins, a senior Foreign Office official, contradicted claims from Downing Street regarding the vetting process.
• 03The Foreign Office overruled a recommendation against Mandelson's clearance despite the Prime Minister's announcement of his appointment.
• 04Concerns about Mandelson's business ties to China and past associations were raised during the vetting.
• 05An investigation is underway to understand how Mandelson was granted clearance despite the failed vetting.

This situation raises questions about the integrity of the vetting process for high-level appointments, which could affect public trust in government transparency.