It comes after it emerged the peer failed security vetting but the Foreign Office still allowed him to take up the post.

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

A decision to go against the recommendation of the vetting agency was taken by officials in the Foreign Office, spokesperson says.

It comes after it emerged the peer failed security vetting but the Foreign Office still allowed him to take up the post.

Keir Starmer understood to have lost confidence in official over decision to override security vetting failure

The PM is facing calls to resign over the revelation that Lord Mandelson did not pass security checks.

Starmer says ministers were in the dark, but friends of former top civil servant suggest it was a case of them looking the other way

Almost all officials working in Foreign Office HQ undergo process before gaining access to top secret material

The most senior civil servant in Britain's Foreign Office has been fired former ambassador Peter Mandelson's security vetting not being disclosed.

Simon McDonald says Olly Robbins was ‘thrown under a bus’ by the prime minister and the decision feels wrong