Starmer told to QUIT over 'lies' amid claims Mandelson FAILED security vetting for US envoy

By JAMES TAPSFIELD, UK POLITICAL EDITOR 15:40 16 Apr 2026, updated 17:24 16 Apr 2026

Keir Starmer is facing a growing clamour to quit today amid claims Lord Mandelson failed security vetting before being made US ambassador.

The New Labour architect is said to have been initially denied developed vetting clearance in January 2025 - weeks after the PM had officially announced his appointment.

However, according to the Guardian the Foreign Office deployed a rarely-used power to override the recommendation from security officials.

The apparent refusal to sign off on Mandelson has not previously been revealed, despite the Government being forced by MPs to release of a batch of documents about the process. It is not clear whether it was because of his ties to Jeffrey Epstein. 

Sir Keir previously insisted Mandelson was subject to 'security vetting, carried out independently by the security services, which is an intensive exercise that gave him clearance for the role'.

The Conservatives, Reform, the Lib Dems and the Greens have now all called for Sir Keir to go. Labour MPs are also urging the Prime Minister to come clean.

Tory leader Kemi Badenoch said: 'Last September, Keir Starmer told Parliament three times that "full due process" was followed over the appointment of Lord Mandelson. 

'We now know the Prime Minister misled the House. The Prime Minister must take responsibility.' 

Nigel Farage said: 'Now we discover that he has blatantly lied, the Prime Minister should resign.' 

Lib Dem leader Ed Davey also called for the PM's resignation. 'Keir Starmer had already made a catastrophic error of judgement,' he said. 

'Now it looks as though he has also misled Parliament and lied to the British public. If that is the case, he must go.' 

The claims risk reviving the furore that already came close to exploding Sir Keir's premiership in February.

Labour MPs have been up in arms that Mandelson was given the key job despite long-standing ties to Epstein.

The Guardian cited multiple sources for the claim, and it is not known whether the PM was aware his pick for ambassador had not been approved by the UKSV agency.

It is understood Mandelson is adamant that he did not know he had been rejected until the reports today.  

It is also not clear who in the Foreign Office made the apparent decision to overrule UKSV. 

Olly Robbins is believed to have been the permanent secretary at the time, while Deputy PM David Lammy was Foreign Secretary. 

Developed vetting is standard for most mid-level diplomatic staff. An outright refusal of clearance is believed to be quite rare, although 'mitigations' can be requested.  

In another potentially incendiary claim, the Guardian said senior Government officials have been considering whether to withhold documents about the refusal from Parliament. 

Labour MPs rebelled to insist on the publication of a huge range of material about the process, and the cross-party Intelligence and Security Committee is meant to be having the final say on what is too sensitive for publication. 

The Daily Mail understands no document showing that vetting clearance was initially refused has been supplied to the ISC so far.

At an event in East Sussex on February 5, Sir Keir said: 'There was a due diligence exercise that culminated in questions being asked because I wanted to know the answer to certain issues.

'That's why those questions were asked. The answer to those questions were not truthful.

'There was then, I should add, security vetting carried out independently by the security services, which is an intensive exercise that gave him clearance for the role, and you have to go through that before you take up the post.

'Clearly, both the due diligence and the security vetting need to be looked at again.

'I've already strengthened the due process. I think we need to look at the security vetting because it now transpires that what was being said was not true. And had I known then, what I know now, I'd never have appointed him in the first place.'

On September 16 last year, Yvette Cooper - by then Foreign Secretary - and Sir Olly wrote to the Foreign Affairs Select Committee in response to questions about the vetting.

'Peter Mandelson's security vetting was conducted to the usual standard set for developed vetting in line with established Cabinet Office policy,' the letter said.

However, it did not mention that UKSV had initially refused clearance. 

Labour MP Bell Ribeiro-Addy said: 'The Government must come clean about why the Foreign Office overrode security officials' decision to deny Mandelson clearance.

'This scandal has been beyond damaging, as has the Government's handling of it. We need the full facts.'

The Prospect union, which represents vetting officers at UKSV, accused No10 of allowing the 'impression to circulate' that people had not done their jobs properly. 

General Secretary Mike Clancy said: 'It is deeply unfortunate that following the resignation of Morgan McSweeney Downing Street allowed the impression to circulate that the vetting of Peter Mandelson had not been done correctly by UK Security Vetting.

'Not only were UKSV put in an invidious position by being asking to conduct vetting after an appointment had been announced, but now deeply troubling reports have appeared in in the media claiming that UKSV advice was overruled.

'Civil Servants, particularly those working in the most sensitive parts of government cannot speak publicly, and deserve ministers to take responsibility for the decisions they take and not to seek to deflect blame onto them.'

Senior Tory MP David Davis suggested Sir Keir must have known if Mandelson had failed his security vetting.

The ex-Cabinet minister posted on X: 'In what sort of Government does the Foreign Office override a vetting failure for the most senior ambassadorship in the world without notifying the Prime Minister?

'It must be presumed that Starmer knew of this vetting failure when he officially appointed him.

'Frankly, this calls into question the Prime Minister's claims that he made the decision because Mandelson had lied to him, since he would have had the accurate conclusions of the vetting process when he made the decision.'

It previously emerged that Sir Keir did not speak to Mandelson personally before appointing him as US ambassador.

The PM is said to have left his aides to ask questions about his ties to Epstein.

That was despite being presented with evidence that Mandelson's friendship had continued after the financier was jailed.

National security adviser Jonathan Powell also expressed misgivings during the process.

However, Sir Keir went ahead, after apparently agreeing with chief of staff Morgan McSweeney on three questions that Mandelson needed to be asked.

Mr McSweeney resigned in February saying he took full responsibility for the appointment going ahead. 

Mandelson was arrested on February 23 on suspicion of misconduct in public office, having been accused of passing sensitive information to Epstein during his time as business secretary under Gordon Brown.

He was subsequently bailed, but later handed his passport back and freed under investigation. He has denied any criminal wrongdoing or acting for personal gain.