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

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.

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

Speculation over the prime minister’s future dominates UK front pages after the Guardian revealed Peter Mandelson failed his security vetting

Darren Jones says he has ordered an urgent review into news that the Foreign Office ignored security vetting advice

The decision to appoint Peter Mandelson as envoy to the Trump administration has backfired spectacularly and could bring down the prime minister.

PM says he is ‘furious’ and did not know security officials had recommended that Mandelson be denied clearance

Starmer’s disastrous decision to make New Labour veteran the US ambassador has led to months of political outcry

PM responds to Guardian revelations that Foreign Office overrode failed security vetting for former minister

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

How did the PM’s chosen US ambassador fail security vetting but still get approved, what exactly did he know, and who is to blame?

PM says it is ‘staggering’ and ‘unforgivable’ that he was not told Mandelson had failed security vetting. Lucy Hough speaks to the Guardian’s head of investigations, Paul Lewis

Exclusive: Officials have spent weeks debating whether or not to release highly sensitive information about the affair

As revelations mount and accusations fly, prime minister prepares for MPs’ anger and Olly Robbins’ testimony early next week

The Independent put revelations that Peter Mandelson had failed MI6 vetting for the US ambassador role to Downing Street in September – but a ‘furious’ PM insists he did not know…

Inquiries into who knew what, and when, will be pored over in coming weeks and could ultimately decide Starmer’s fate

PM said he was ‘staggered’ not to have been told that Peter Mandelson had failed his security vetting before becoming ambassador to the US

The Independent put revelations that Peter Mandelson had failed MI6 vetting for the US ambassador role to Downing Street in September – but a ‘furious’ Sir Keir insists he did not…

Starmer faces mounting pressure amid calls to resign as over Mandelson's failed security vetting and what the prime minister knew

Deputy prime minister says it is ‘inexplicable’ top civil servant kept Downing Street in dark