How Peter Mandelson went from US ambassador to arrested over misconduct claims
Peter Mandelson was released on bail this week after being arrested on suspicion of misconduct in public office. Coming just days after the arrest of Andrew Mountbatten-Windsor, the images of the former US ambassador being led away by police will likely stick with viewers for some time.
The political ramifications of Mandelson’s appointment as ambassador to the US continue to reflect badly on Keir Starmer’s political judgment. While this is a story that will likely run and run, it is worth taking stock of how we got here.
December 19 2024: Mandelson appointed US ambassador
When Starmer chose Mandelson as ambassador, the general reaction was that it was a risk. The BBC pointed to his friendship with the late financier and sex offender Jeffrey Epstein, and described him as “not a baggage-free choice”. This baggage, if being friends with a known paedophile was not enough, included having to resign from government twice during the New Labour years.
Matthew Lynn, in the Telegraph, went further, arguing that he would make a “terrible” ambassador because he was both “damaged goods” and “put politely … accident prone”. For balance, Tom Harris (also in the Telegraph) described Mandelson as a “political genius” and “the right man to deal with Trump”.
This was, ultimately, the gamble taken by Starmer and his team. They appointed a known associate of Epstein with a dubious ethical track record, but who was – as a Downing Street source told the BBC in February 2025 – “supremely political” and a “brilliant operator”.
May 8 2025: Front and centre of UK-US trade deal
“Cometh the hour, cometh the Mandelson”, read the Guardian headline the day after the UK and the US agreed to a trade deal. A deal which, not for nothing, may well have been unpicked by Trump’s response to the Supreme Court ruling his tariffs unconstitutional. The Times said that Mandelson had “proven the doubters wrong”, and called him the “Trump whisperer”.
This was the moment, as I previously outlined in the Conversation, of supreme triumph. And it was widely seen, across the political spectrum, as vindication of the risk Starmer took.
September 8 2025: Birthday messages to Epstein released, Mandelson fired
The wheels came off with the release, by a US congressional panel, of a 238-page scrapbook given to Epstein for his 50th birthday. In it, Mandelson’s multi-page message to Epstein described him as his “best pal”. Mandelson said that he regretted “very, very deeply indeed, carrying on that association with him for far longer than I should have done”.
Starmer was initially supportive of Mandelson in the Commons, but sacked him after newly surfaced emails showed that he had sent supportive messages to Epstein when he faced charges of soliciting a minor in 2008. The BBC later reported that Number 10 and Foreign Office officials were aware of these emails prior to Starmer’s defence of Mandelson at prime minister’s questions, but that Starmer himself was not aware of the contents.
January 30 2026: Further Epstein files released
The release of further information about the close relationship between Mandelson and Epstein pointed to potential criminality. The emails, published by US officials, suggest that Mandelson passed privileged and market-sensitive information to Epstein during the fallout of the financial crisis. This led to the police investigation for misconduct in public office. Mandelson’s position, according to the BBC, is that he has not acted in any way criminally and that he was not motivated by financial gain.
Read more: Mandelson and the financial crash: why the Epstein allegations are so shocking
February 4 2026: MPs approve the release of documents
A House of Commons debate was held surrounding the release of files related to the appointment of Mandelson as US ambassador. Starmer initially suggested that files which could damage diplomatic relations or national security would be exempt from release. However, after an intervention from Angela Rayner, the government agreed to include a cross-party parliamentary committee in the process. The BBC has subsequently reported that these documents could number over 100,000.
February 23 2026: Mandelson arrested
Mandelson was arrested Monday night on suspicion of misconduct in public office, and released on bail Tuesday morning. Mandelson has claimed that his arrest was based on the “complete fiction” that he was a flight risk and planning to flee to the British Virgin Islands (which have an extradition agreement with the UK). It has now emerged that Commons Speaker Lindsay Hoyle passed information to the police ahead of the arrest.
What happens now?
Misconduct in public office is notoriously difficult to prosecute and tends to rely on a three stage test: that the accused must have been acting in an official capacity at the time of the alleged offence, that they wilfully misconducted themselves and that that conduct falls “so far below acceptable standards that it amounts to an abuse of the public’s trust”.
Legal experts suggest that the latter is an incredibly high bar. In this instance it might well be the case that simply leaking information does not meet that bar, and that the police will need to show some kind of material gain or beneficial exchange. Either way, Mandelson will ultimately be required to return to a police station when he will either be charged, have his bail extended or face no further action.
Further questions, naturally, will also be asked of Starmer’s judgement. A Cabinet Office due diligence report into Mandelson’s appointment is reportedly expected as early as next week. The document is said to have warned of the “reputational risk” of making him ambassador.
If this is the case, it could reignite conversations about Starmer’s leadership and a potentially bruising night in the Gorton and Denton byelection on Thursday won’t help. Though Starmer’s replacement in most circles is now being discussed as a matter of when, not if.
In the end, Starmer is learning the hard way – just as Boris Johnson did before him – that standards matter in British politics. It is not enough, as Starmer did when he updated the ministerial code, to just talk a big game. One cannot say that “restoring trust in politics is the great test of our era” and then do very little to actually address the root cause of that trust.
Sam Power has received funding from the Economic and Social Research Council and the Engineering and Physical Sciences Research Council.