The bad news keeps coming for Keir Starmer with new trove of Mandelson files due to be published - AP News

More Mandelson files released in UK bring bad news for Starmer, but many questions remain unanswered

Britain’s Prime Minister Keir Starmer looks on during a visit to Acorn Nursery, in Brighton, England, Tuesday May 26, 2026. (Gareth Fuller/Pool Photo via AP)

Peter Mandelson, the former U.K. ambassador to the United States, walks past the Ministry for Health in London, Thursday, May 14, 2026.(AP Photo/Kirsty Wigglesworth)

Britain’s Prime Minister Keir Starmer visits a children’s activity centre in Essex, England, Thursday, May 21, 2026 to support families and help ease pressures on household budgets.(AP Photo/Kin Cheung, Pool)

LONDON (AP) — Peter Mandelson assured the British government it would “never regret” appointing him as U.K. ambassador to the United States, according to documents released on Monday. His pledge was dramatically proven wrong within months.

More than 1,500 pages of files relating to the appointment of Mandelson, a friend of convicted sex offender Jeffrey Epstein, as envoy to Washington at the start of U.S. President Donald Trump’s second term were released by the government to comply with a demand by lawmakers.

They shed new light on the contentious decision and heap more embarrassment on beleaguered Prime Minister Keir Starmer.

Among the documents is a note from Mandelson to then Foreign Secretary David Lammy in November 2024, before his appointment, pledging that the government would “never regret” giving him the post.

Starmer fired Mandelson after nine months when new details emerged about his friendship with Epstein, and fallout from the misjudged appointment has left the prime minister fighting for his job.

Alex Burghart, a lawmaker for the opposition Conservative Party, said that the decision to appoint Mandelson “is a failure that will define this prime minister’s premiership.

“It is a failure that will be written as his political epitaph,” he said.

Mandelson’s security vetting process

A first trove of files published in March revealed ministers had been warned that Mandelson’s friendship with Epstein exposed the government to “reputational risk.”

It was later disclosed that Mandelson had been approved for the ambassador’s job despite failing security checks, a revelation that sparked bitter blame-trading between Starmer and senior civil servants.

The files released Monday show officials from multiple departments discussing Mandelson’s security vetting, a process that National Security Adviser Jonathan Powell described in previously released files as “weirdly rushed.”

One senior Foreign Office official said the primary issue was “trying to get 101 things done in a very short period of time.”

In one email, Mandelson asked vetting officials if he needed to tell them about “literally every foreign national I have ever met.” A Foreign Office official suggested he “send over the handful of names you mentioned.... That will reassure the vetting team that you’ve been comprehensive, even if it’s all quite artificial.”

It remains unclear why Mandelson failed security checks. The summary of his vetting wasn’t among the documents released, as it’s part of a police investigation into Mandelson for alleged misconduct in public office.

Officials have said ties to Epstein are not the reason he failed the vetting. A background report drawn up by officials before Mandelson was appointed, released by the government in March, flagged business ties to Russia and China as a concern.

Also missing is any record of what measures, if any, were taken to mitigate the risk of giving Mandelson the job.

Mandelson refused to hand over information from his personal phone to officials, and the government “has no further recourse to search the personal devices of Peter Mandelson,” the documents say.