Labour faces a contempt motion if the government withholds any papers relating to the appointment of Peter Mandelson as ambassador to the United States, after the Intelligence and Security Committee (ISC) accused ministers of redacting material “far too broadly” and withholding key documents including the former minister’s vetting file.
Contempt motion threatened
The Conservatives have confirmed they will table a motion holding ministers in contempt of parliament if the government fails to comply fully with the humble address demanding the release of all papers connected to Lord Mandelson’s appointment. The motion – which would trigger an inquiry by the Commons Privileges Committee – is likely to target individual ministers, including the prime minister.
A number of Labour MPs have indicated they would support such a move. Kim Johnson, the Labour MP, told the news website that colleagues would be inclined to back it because they want “to distance themselves from the corruption and sleaze”. Another Labour MP said the prime minister “has no authority” and that “anything he now does that undermines us further will have limited tolerance”, though they noted it would be better if the motion came from the Liberal Democrats “as it would be harder for Labour MPs to be associated with Tory games”.
Independent MP Karl Turner, suspended from the Labour Party after criticising judicial changes, said he had discussed the prospect with veteran Tory MP Sir David Davis. He estimated that only “maybe 35 to 45 Labour backbenchers would have the bottle to support a contempt motion”, but warned that “the bigger concern for the government is abstentions”. He added: “Far too many are just simply finding excuses not to be there for important votes.”
Priti Patel, the shadow foreign secretary, accused Labour ministers of being “up to their necks in this scandalous cover up of the Mandelson-Epstein files”. She said the Conservatives had pushed in parliament for full transparency, backing the ISC to have the final say, but that “instead we have Labour ministers walking all over due process and ignoring what was unanimously decided by Parliament”. She warned that if the government defied the will of the Commons by refusing to release key files – “a clear example of contempt” – the Conservatives would “use every available tool to force them to come clean with MPs and the public”.
ISC accuses government of over-redaction
The dispute centres on a humble address – a formal parliamentary petition to the monarch that compels the government to release documents – passed after a Labour backbench rebellion forced ministers to compromise. The government had initially proposed that the Cabinet Secretary would decide what could be withheld on national security or international relations grounds, but former deputy prime minister Angela Rayner intervened to insist that the Intelligence and Security Committee should have that role instead.
The humble address as passed gives only the ISC the power to redact material – not the government. A source familiar with the process said: “The humble address is very specific: it only gives the committee the power to redact, not the government. So if the government goes ahead and redacts things it will not be complying with the humble address and that will open a whole can of worms.”
The ISC, which is overseeing the release of the documents, has publicly stated that the government is redacting information “far too broadly” and withholding material without proper authority. The committee has resolved to tell the government that it must indicate wherever it has redacted material without the permission of the committee. A fresh tranche of papers is expected to be published next week following a meeting of the ISC.
The Metropolitan Police has also asked that certain documents be withheld to avoid prejudicing an ongoing criminal investigation. Lord Mandelson was arrested in February 2026 on suspicion of misconduct in public office over allegations that he passed market-sensitive information to convicted sex offender Jeffrey Epstein during the 2008 financial crisis. He denies wrongdoing and has not been charged.
The background to the document demand is a series of revelations about how Lord Mandelson came to be appointed as UK ambassador to the US in December 2024, taking up the role in February 2025. Prime Minister Sir Keir Starmer initially said he was “delighted” to make the appointment, citing Mandelson’s experience. However, it emerged that UK Security Vetting (UKSV) had recommended against granting Lord Mandelson “developed vetting” clearance in January 2025. Olly Robbins, the then-permanent secretary at the Foreign Office, granted it anyway, citing “mitigations” to manage risks. Robbins later testified that he felt pressured by Downing Street to expedite the process and that officials had a “dismissive attitude” towards security checks.
Lord Mandelson was dismissed as ambassador in September 2025 after the publication of emails revealing the extent of his relationship with Epstein, including his support for Epstein after the 2008 conviction. Sir Keir Starmer said Lord Mandelson had “lied repeatedly” about the relationship and had “betrayed our country, our Parliament, and my party”. The vetting file also flagged concerns about Mandelson’s ties to senior figures in China, Russia and Israel, as well as a £1 million loan for an Israeli startup. A former head of MI6 said mitigating those risks would have been “totally impossible”.
Potential consequences
If the government fails to comply with the humble address, the contempt motion would trigger a formal inquiry by the Commons Privileges Committee. The Conservatives have noted that a precedent was set during the Brexit negotiations, when a similar humble address forced the government to release papers linked to the exit talks. A source who worked in Downing Street at the time said: “The government blinked on that one once a contempt vote was threatened.”
The issue has been informally raised with the Speaker, Sir Lindsay Hoyle, over what might happen if the will of the Commons is ignored. The Commons press office has said that Sir Lindsay will not comment on any discussions or hypotheticals. However, senior Labour figures could find themselves at odds with the government on the issue. Karl Turner noted that the last motion for a privileges committee inquiry was defeated, but that “MPs were livid that we’d been forced to get there. Far too many abstained. And those that didn’t made it abundantly clear that they would not allow to have targets placed upon their backs for the sake of saving Starmer when we all know that he’s dead.”
A Downing Street spokesperson said: “As we have repeatedly said, we are committed to complying with the humble address in full.”
