Starmer Would Have Blocked Mandelson's Appointment Over Vetting Failure, Says Lammy

Deputy PM Lammy claims PM Starmer was unaware of security concerns that led to Mandelson's failed vetting

Apr. 18, 2026 at 9:54pm

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A dimly lit government office desk in warm, golden light, with deep shadows, conveying a sense of quiet contemplation and unease over the Mandelson vetting scandal.The fallout from the Mandelson vetting failure casts a long shadow over Downing Street, exposing tensions between diplomatic urgency and security protocol.Washington Today

Deputy Prime Minister David Lammy has asserted that Prime Minister Keir Starmer would have blocked Peter Mandelson's appointment as the UK's ambassador to Washington had he been informed that Mandelson failed security vetting. Lammy's comments come as the government attempts to manage the damaging fallout from revelations that the Foreign Office overruled a decision to deny Mandelson clearance.

Why it matters

This crisis highlights a precarious tension between diplomatic urgency and security protocol. By prioritizing a rapid response to the change in U.S. Administration, the government may have created a blind spot that now threatens the Prime Minister's perceived authority over his own civil service.

The details

Records indicate that Oliver Robbins, the former top civil servant forced out of the Foreign Office this week, received the vetting outcome after Mandelson's appointment had already been announced. Despite a separate due diligence process, Robbins flagged the potential reputational risk of sending Mandelson to Washington. Some insiders suggest Robbins may have been acting on what he believed were expectations at the time, while allies argue he was simply following established rules to keep vetting details away from ministers.

  • In January, the appointment process faced significant 'time pressures' driven by the need to have a UK ambassador in place as Donald Trump was re-entering the White House.
  • This week, the revelations about Mandelson's failed vetting came to light.

The players

Keir Starmer

The Prime Minister of the United Kingdom.

David Lammy

The Deputy Prime Minister of the United Kingdom.

Peter Mandelson

The former UK ambassador to Washington whose appointment was announced despite failing security vetting.

Oliver Robbins

The former top civil servant at the Foreign Office who was forced out this week after keeping Downing Street unaware of Mandelson's vetting failure.

Yvette Cooper

The Foreign Secretary who has ordered a full review of information provided to the foreign affairs committee regarding the security vetting process.

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What they’re saying

“Lammy described it as 'inexplicable' that Oliver Robbins, the former top civil servant forced out of the Foreign Office this week, chose to keep Downing Street unaware of the vetting outcome.”

— David Lammy, Deputy Prime Minister

“Lammy reported being 'shocked and surprised' when he first learned of the situation although on a military flight returning from the Middle East.”

— David Lammy, Deputy Prime Minister

What’s next

Keir Starmer is scheduled to face MPs on Monday as he seeks to limit the damage to his premiership. Meanwhile, Liberal Democrat leader Ed Davey has called for the government to 'come clean' by publishing the initial due diligence report on Mandelson. Foreign Secretary Yvette Cooper has ordered the Foreign, Commonwealth and Development Office (FCDO) to conduct a full review of all information provided to the foreign affairs committee regarding the security vetting process.

The takeaway

This scandal highlights the delicate balance between diplomatic urgency and rigorous security protocols. The government's apparent prioritization of a swift response to the U.S. administration change may have created vulnerabilities that now threaten the Prime Minister's authority and public trust in the civil service.