Mandelson was given secret spreadsheet to vet left-wing MPs in Labour power struggle
Whistleblower’s revelation shows extent of his direct involvement in bitter battle to gain control of the party ahead of 2024 election
February 04, 2026 12:24 pm (Updated 4:13 pm)
5 min read
A Labour source revealed Mandelson helped to identify potential candidates who were seen as too left-wing to run for the party (Photo: Jaimi Joy/Reuters)
Disgraced peer Peter Mandelson was directly involved in helping Morgan McSweeney select Labour’s parliamentary candidates ahead of the 2024 general election, a party whistleblower has told The i Paper.
The Labour source revealed how Mandelson helped to identify potential candidates who were seen as too left-wing to run for the party.
He was given access to a secret Google spreadsheet of potential candidates that McSweeney and his allies used, the source said.
McSweeney was the party’s campaigns director at the time and is now chief of staff at No 10.
A Labour Party spokesperson said Mandelson had “no role” in official candidate selection, but The i Paper understands the spreadsheet was an “off the books” exercise conducted amid the power struggles within the party.
The prime minister – who is clinging on to his premiership amid growing calls to resign – has been constantly embattled by the fallout from his decision to appoint Lord Mandelson as Britain’s ambassador to Washington.
The former Labour peer was sacked last September when new information about his links to Jeffrey Epstein emerged, and the scandal has threatened to bring down the government several times since.
MPs ordered the government to publish a huge tranche of documents connected to the appointment in February, but so far only a handful have been released.
According to Sky News, parliament’s Intelligence and Security Committee – which decides which documents are excluded on the basis of being prejudicial to the national interest or damaging to international relations – is expected to announce the release of further files, which could come as soon as next week.
Keir Starmer’s decision to appoint Peter Mandelson as the UK ambassador to the US has been disastrous for the prime minister (PA)
Following his sacking, Lord Mandelson resigned from the Labour Party and the House of Lords in March when fresh emails and photographs surfaced in the latest tranche of the so-called Epstein files in the US.
Lord Mandelson was arrested in late February on suspicion of misconduct in public office, following claims he had leaked sensitive government information to Jeffrey Epstein when he was business secretary under then prime minister Gordon Brown.
Sir Keir has faced repeated calls to resign over the scandal, which Labour politicians said had hurt the party on the doorstep ahead of their devastating defeat in local elections last week.
Last month, Sadiq Khan warned the “omnishambles” of his appointment had left Labour in danger of “being stonked” across London in the local elections. The party went on to face defeats both in the capital and in historic strongholds across the country.
The party’s losses at the polls have left Sir Keir fighting for his political life, with almost 100 Labour MPs having publicly called for his resignation so far.
The party’s losses at the polls have left Starmer fighting for his political life, with almost 100 Labour MPs having publicly called for his resignation so far (AP)
As pressure continues to pile on the prime minister, his health secretary Wes Streeting is said to be preparing a leadership challenge, despite the prime minister stating he retained “full confidence” in the health secretary on Wednesday.
His former deputy prime minister, Angela Rayner, also appeared to pave the way for a bid on Thursday, as she revealed she has been cleared of deliberate wrongdoing following an investigation into her tax affairs.
The further release of Mandelson files will undoubtedly pile further pressure on Sir Keir if he has not yet resigned, but also threatens to implicate potential leadership challengers in government at the time of the appointment.
Mr Streeting last month admitted he failed to take reports of Lord Mandelson’s links to paedophile Epstein seriously when they emerged in 2023.
Wes Streeting is said to be preparing to stage a leadership challenge (PA)
The health secretary, who has faced questions over his political relationship and friendship with the disgraced peer, said he “absolutely” questioned his own judgement on the matter and said there had been a political and media failure to ask enough questions about their relationship before Lord Mandelson took up his post.
In February, Mr Streeting published a series of texts between himself and Lord Mandelson, revealing his criticism of Sir Keir Starmer’s government, after Sky News suggested that he was “close friends” with Lord Mandelson.
The health secretary dismissed the claim as a “smear” by his critics within the party, although he admitted Lord Mandelson had helped him in the past, and he went on to delete social media posts with pictures of the two.
Retired, living in the Scottish Borders after living most of my life in cities in England. I can now indulge my interest in all aspects of living close to nature in a wild landscape. I live on what was once the Iapetus Ocean which took millions of years to travel from the Southern Hemisphere to here in the Northern Hemisphere. That set me thinking and questioning and seeking answers.
In 1998 I co-wrote Millennium Countdown (US)/ A Business Guide to the Year 2000 (UK) see https://www.abebooks.co.uk/products/isbn/9780749427917
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