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Ousted former British Foreign Office chief Olly Robbins made an explosive accusation on Tuesday that shocked Westminster. The ex-official who was behind the approval Peter Mandelson’s appointment as British ambassador to Washington claimed he felt “political pressure” from 10 Downing Street to speed up the process.
British Prime Minister Keir Starmer’s office maintained a “dismissive attitude” towards security protocols and applied significant pressure to circumvent vetting concerns over Mandelson’s appointment, Robbins said during high-risk testimony to Britain’s Foreign Affairs Committee.
He described an “atmosphere of constant pressure” at 10 Downing Street that led to red flags being sidestepped and Mandelson quickly pushed into his role despite looming security concerns, said the former head of Britain’s Foreign Office, who was sacked by British Prime Minister Starmer.
There is “a very, very strong expectation” that Mandelson “needs to be in post and in America as quickly as possible,” Robbins said.
The revelation, which is in direct contradiction to Starmer’s claims that he was “kept in the dark”, suggests that Mandelson’s appointment may have been rushed ahead of US President Donald Trump’s second term. It underlines the “dismissive attitude” towards critical security checks.
With Starmer now accused of misleading the British Parliament and calls for his resignation growing amid his fight for political survival, the “Mandelson review bombshell” is turning from a diplomatic scandal into a full-blown existential crisis for the Labor government.
Starmer has been under intense fire, including from Labor MPs, for shortlisting two controversial political figures with alleged links to convicted sex offender Jeffrey Epstein, including Mandelson. Tory leaders including Semi-Badenoch previously questioned his decision to hand the peerage to former communications chief Matthew Doyle.
Robbins stated that Mandelson received approval for the developed review (DV) despite the concerns of the UK security agency tasked with carrying out the checks. The former British Foreign Office secretary said the DV process was already underway when he took on the role in January last year and Mandelson had been granted access to top-secret briefings on a case-by-case basis.
The “due diligence review (which assesses reputational suitability and whether a candidate is suitable for the position) was conducted by the Cabinet Office,” Robbins said. “Despite this pressurized atmosphere, the department completed the DV at a normally high level,” he added. This, according to Robbins, led to “a negative attitude towards DV” on the part of Number 10.
MPs are currently taking part in an emergency debate on: Government accountability to the House of Representatives in relation to the appointment of Peter Mandelson as Ambassador to the United States of America.
Watch live ⬇️https://t.co/uonwBgF3sp pic.twitter.com/hSng5tYL43
— House of Commons (@HouseofCommons) April 21, 2026
The allegations of security breaches
Giving evidence to a parliamentary inquiry into British government standards, Robbins revealed that the Cabinet Office was feeling enormous pressure from the highest levels of government to expedite Mandelson’s clearance.
He claimed that he had not seen the UKSV document examining Mandelson himself, but had been informed of the results by the Foreign Office security chief. He was told that Mandelson was the “borderline case” for the UKSV and was inclined to recommend refusal of clearance.”
Despite red flags raised by security officials over their extensive business dealings abroad, Robbins said political expediency took precedence over national security precautions.
According to Robbins, the risks in the Mandelson case were not related to the Labor politician’s connections to Epstein.
No 10’s dismissive attitude created an environment of tension in which professional advice from the Foreign Office and security services was treated as a hindrance rather than a necessity, Robbins claimed.
Furthermore, he described a culture in which the urgency of political appointments was more important than the usual scrutiny required for high-level positions. The risk was assessed as “mitigable,” he claimed.
In a letter to the House of Commons Foreign Affairs Committee before his disappearance, Robbins noted: “DP clearance is a risk assessment. This is particularly true the older a candidate is and the longer their career. Addressing these risks as part of the clearance process is not unusual.”
Focus on foreign links
While the public inquiry focused on Mandelson’s past association with the late American financier Epstein, Robbins clarified in his appearance on Tuesday that the primary vetting failures were actually related to Mandelson’s foreign business interests.
The The UK Foreign Office’s Estate Security and Network Directorate (ESND) expressed concerns that these “foreign connections” could create potential vulnerabilities that had not been adequately mitigated prior to Mandelson’s proposed diplomatic or advisory roles.
British Prime Minister Starmer spent two and a half hours in the House of Commons on Monday, defending himself by saying he only learned of UKSV’s concerns last week. He called it “astonishing” that the Foreign Office had not given him a complete picture of the security concerns.
Starmer accused officials of “deliberately” keeping him in the dark.
Robbins said in his statement that ministers had not been informed of any results of the review process other than the final outcome. He added that it was only last year after Mandelson’s sacking in September that he thought about looking at the UKSV documents.
A growing divide in Westminster
Robbins’s statement has sparked debate about the independence of Britain’s civil service as it suggests a systemic breakdown in which the “permanent government”, the civil servants tasked with maintaining national security, are increasingly sidelined by the “political government”.
Critics argue that allowing the review process to be “rushed” due to political pressure will undermine the integrity of Britain’s security apparatus.
Conversely, supporters of the appointment process suspect that the delays are due to bureaucratic overreach rather than legitimate security threats. The allegations are proving sensitive, particularly for Starmer, who faces calls for his ouster over the high-profile diplomatic blunder.
As the British government seeks to fill these key diplomatic roles, including the high-profile position of British ambassador to the United Kingdom, the shadow of the Mandelson review controversy looms large. The investigation is continuing to examine whether the failures were isolated incidents or whether they indicate a broader change in the way No. 10 handles sensitive security information.
