British Prime Minister Keir Starmer faces the threat of further resignations following the release of thousands of documents, including WhatsApp messages, related to the controversial appointment of Peter Mandelson as UK Ambassador to the United States.

 

Starmer may face more resignations after release of Mandelson WhatsApp messages, say sources

British Prime Minister Keir Starmer faces the threat of further resignations following the release of thousands of documents, including WhatsApp messages, related to the controversial appointment of Peter Mandelson as UK Ambassador to the United States.

 

Key Developments in the "Mandelson Files"

Imminent Disclosures: Senior government sources have warned that the next "tranche" of files, which includes informal ministerial WhatsApp communications, could contain highly damaging details leading to more departures from the administration.

 

Admission of Error: On March 12, 2026, Starmer publicly apologized, stating, "It was me that made a mistake" regarding the handling of Mandelson’s appointment and the vetting process.

Ignored Warnings: Documents released in the first batch on March 11, 2026, revealed that Starmer was explicitly warned of the "reputational risk" posed by Mandelson's close ties to convicted sex offender Jeffrey Epstein, yet he proceeded with the appointment.

Previous Resignations: The crisis has already led to the resignations of top aides, including Starmer's chief of staff Morgan McSweeney and director of communications Tim Allen in February 2026.

 

Potential Fallout

The upcoming release of more than 100,000 documents is expected to be one of the largest disclosures of confidential government records since the Covid inquiry.

Ministerial Pressure: Opposition parties, including the Conservatives and Liberal Democrats, have suggested Starmer may have misled Parliament—a resigning offense—regarding how Mandelson was vetted.

 

Public and Party Scrutiny: There are reports of several Labour MPs being in talks to defect to the Green Party as the scandal continues to overshadow the government’s agenda.

Police Investigation: Peter Mandelson remains under police investigation for alleged misconduct in public office, specifically concerning claims of leaking sensitive government information.

The next release of messages is expected to take several weeks as they are collated and reviewed by the Intelligence and Security Committee (ISC) to ensure national security is not compromised.