Exclusive: deputy PM says UK will not join Iran conflict despite Trump’s sometimes ‘incomprehensible’ social-media barbs

Donald Trump’s insults towards Keir Starmer are “small and petty” and designed to put pressure on the prime minister to change his position on Iran, David Lammy has said, as he insisted the UK would not get dragged into the conflict.

The deputy prime minister argued the US president should be able to “disagree agreeably” with allies rather than publishing attacks on social media, and that US actions had “made things worse, not better” as far as global instability was concerned.

Prime minister to deliver high-stakes statement to MPs over vetting controversy that has put his position in peril

Keir Starmer will deliver a high-stakes statement to MPs on Monday as he struggles to overcome fears inside his government that the Peter Mandelson vetting scandal could yet cost him his leadership.

In what is set to be a dramatic showdown, the prime minister will set out how Mandelson was able to take up his role as UK ambassador without the Foreign Office revealing it had overruled the decision to fail his vetting.

Ahead of a showdown with MPs, prime minister looks like a man who is not really in control in his own government

Keir Starmer has spent much of the last 24 hours working on a plan for what senior government figures are already describing as his “judgment day”: his showdown with MPs on Monday over the latest Peter Mandelson revelations.

That the prime minister was apparently not told of Mandelson’s vetting failure has provoked incredulity across Westminster and accusations he sacked a senior civil servant to save his premiership.

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

Keir Starmer would have blocked Peter Mandelson from serving as the UK’s ambassador to Washington had he known he failed security vetting, David Lammy has said, as he attempted to shore up the prime minister amid damaging fallout from the row.

In his first public comments on the vetting affair, Lammy said it was “inexplicable” that Oliver Robbins, the former top civil servant who was forced out of the Foreign Office this week, had opted to leave Downing Street in the dark over the outcome.

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

Keir Starmer was left in the dark about sensitive information relating to Peter Mandelson’s security vetting by two other top civil servants, including the head of the civil service, the Guardian can reveal.

The prime minister said on Friday that it was “unforgivable” and “staggering” that senior officials did not tell him that Mandelson failed a security vetting process weeks before he took up his role as ambassador to Washington.

Exclusive: Adrian Fulford, who chaired the recent Southport inquiry, will also examine the wider national security vetting system

• UK politics live – latest updates

A retired high court judge is expected to review Peter Mandelson’s vetting process and the wider national security vetting system.

The review, commissioned by Downing Street, comes after a Guardian investigation revealing that security officials decided Mandelson should not receive developed vetting clearance, but were overruled by the Foreign Office to allow him to become US ambassador.

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

• Mandelson failed vetting but Foreign Office overruled decision

Sir Olly Robbins, the UK Foreign Office’s top civil servant, has been forced out of his post after the decision to fail Peter Mandelson during his security vetting was overruled by his department.

Robbins was the Foreign Office’s most senior official in late January 2025 when the decision was made, paving the way for Mandelson to become the US ambassador.

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

• Revealed: Mandelson failed vetting but Foreign Office overruled decision

• Five key questions: who overruled decision to deny Mandelson security clearance?

Senior government officials have been considering whether to withhold from parliament sensitive documents that show Peter Mandelson failed security vetting before he assumed the role of US ambassador, the Guardian can reveal.

Any such decision could amount to an extraordinary breach of a parliamentary vote that ordered the release of “all papers” relevant to Mandelson’s appointment.