Sir Keir Starmer is facing mounting political pressure over the appointment of Lord Mandelson as UK ambassador to the United States, after newly published documents raised fresh questions about whether proper security vetting procedures were followed.
According to papers released by the Government, Cabinet Secretary Lord Simon Case wrote to the Prime Minister in November 2024, ahead of the appointment, outlining the standard process for external appointments, including the need to conduct security clearance and due diligence before confirmation.
In the correspondence, Lord Case stated: “You should give us the name of the person you would like to appoint, and we will develop a plan for them to acquire the necessary security clearances and do due diligence on any potential conflicts of interest or other issues of which you should be aware before confirming your choice.”
The documents have fuelled claims that the established vetting advice was not fully followed before Lord Mandelson’s appointment was approved.
A Downing Street spokesman said that external appointments are normally “subject to obtaining security clearance”, but defended the process, pointing to a subsequent review of the national security system, which has since altered how appointments are handled.
Pressed on why the Prime Minister did not follow the Cabinet Secretary’s guidance more closely, the spokesman declined to comment directly, instead emphasising that reforms had now been introduced.
The controversy comes as Sir Keir prepares to address MPs in the House of Commons at 3.30pm, where he is expected to set out what he knew about Lord Mandelson’s vetting process and when.
Opposition figures have accused the Prime Minister of serious failings. Kemi Badenoch described the episode as a “shaming affair”, while Robert Jenrick went further, claiming the Government was “paralysed by a paedophile scandal”. Those claims have not been substantiated.
Tensions within Government have also intensified following the sacking of Sir Olly Robbins, the Foreign Office’s top official, last week after it emerged that Lord Mandelson had been granted developed vetting status despite earlier security concerns being flagged.
It has further been reported that Sir Keir was made aware of the warning signs which contributed to Lord Mandelson’s initial failure to pass security checks, but that those concerns were not acted upon.
A senior Government figure told The Guardian the coming days could prove decisive for the Prime Minister’s leadership, warning that “all roads lead back to the original sin” of the appointment decision.
With pressure building from both sides of the Commons, today’s statement is expected to be a critical moment in determining how far the row will extend into Sir Keir’s premiership.
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