Keir Starmer's troubled premiership faces a make-or-break week as he confronts angry MPs and mounting pressure over the Peter Mandelson security vetting scandal. Accused of "catastrophic" misjudgment and potentially breaking the Ministerial Code, the Prime Minister is expected to address the House of Commons today amidst widespread demands for him to finally take responsibility and cease blaming others.

The core of the controversy lies in the appointment of Peter Mandelson as the US ambassador, despite a clear recommendation from UK Security Vetting (UKSV) in late January 2025 that he should be denied "developed vetting" clearance. This advice was subsequently overruled by the Foreign Office, allowing Mandelson to take up the prestigious post. Starmer has expressed his fury, stating he was "absolutely furious" and kept "in the dark" about this "staggering" omission, a point he intends to make "crystal clear" to MPs.

The scandal has triggered a significant blame game within Westminster. Sir Olly Robbins, the top civil servant at the Foreign Office, was sacked by Sir Keir last week, with the Prime Minister suggesting Robbins should have informed him about the red flags. Robbins, who is reportedly taking legal advice and has been asked to appear before the foreign affairs committee tomorrow, is believed by his allies to have been legally constrained from disclosing vetting details, implying Starmer is shifting blame. However, the government published a statement asserting that civil servants are not prevented from "sensibly flagging UK Security Vetting recommendations or high-level risks and mitigations" to allow ministers to make informed decisions.

Further undermining Sir Keir's claims of being unaware, senior figures in Whitehall reportedly knew about the vetting failure weeks before he did. Cabinet Office Permanent Secretary Cat Little received a document revealing the UKSV advice against Mandelson's clearance in late March. She discussed this with Cabinet Secretary Dame Antonia Romeo and consulted government lawyers before the Prime Minister was finally informed last Tuesday evening. Critics argue this timeline suggests Starmer could have addressed Parliament much sooner and is being disingenuous about his delayed response and failure to immediately correct the record.

Opposition leaders have been vocal in their condemnation. Tory leader Kemi Badenoch has demanded Starmer take "due responsibility," accusing him of breaking the Ministerial Code by failing to be open with MPs and not revealing vetting details promptly. She further charged that the affair was "tawdry and shaming," damaging Britain's relationship with the United States and undermining national security. Liberal Democrat leader Sir Ed Davey labeled Starmer's actions a "catastrophic misjudgment" and "totally incompetent," calling for an inquiry by the privileges committee and the government's ethics watchdog for alleged breaches of the Ministerial Code.

Even within his own party, Starmer faces dissent. Labour peer Lord Glasman publicly called for his resignation, stating, "He cannot conceivably continue as a credible Prime Minister any longer. And that's all because he cannot say, 'I made a mistake, I'm sorry'." Conversely, Science and Technology Secretary Liz Kendall and other Labour allies have defended the Prime Minister, insisting he needed time to "get the facts absolutely clear and right" before addressing MPs, especially given Parliament did not sit on Friday.

As Starmer prepares to face the Commons today, several critical questions demand answers:

• **Did Sir Keir mislead Parliament?** He repeatedly assured MPs that "full due process" and "security vetting" were followed. His aide, Darren Jones, suggested this was technically correct due to a little-known Foreign Office power to overrule vetting concerns, but Starmer faces damaging accusations that he did not tell the truth, regardless of whether he knew the full facts at the time.
• **Why didn't the record corrected immediately?** The Ministerial Code mandates correcting "any inadvertent error at the earliest opportunity." Informed last Tuesday night, Starmer is pressed on why he did not correct the record on Wednesday, before Prime Minister's Questions.
• **Was Sir Keir truly the last to know?** Given that Cat Little and Dame Antonia Romeo were aware of the vetting failure since late March, questions arise about why the Prime Minister was informed weeks later and how many others in No10 knew beforehand.
• **Should he have been informed about the vetting concerns?** Sir Olly Robbins maintains he was not permitted to disclose such information. However, many Whitehall veterans claim they had been informed about similar concerns regarding other candidates in the past.
• **What were the specific reasons for Mandelson's security clearance denial?** While Mandelson's past links to Russia, China, and Jeffrey Epstein are public, the exact reasons UKSV officials raised a red flag for his appointment to Washington are not yet known.
• **Has the Prime Minister seen the full vetting verdict?** No10 officials reportedly received the document last month revealing that "the recommendation from the vetting officer had been that developed vetting should not be granted to Peter Mandelson." However, the reasons behind the advice might be kept secret to protect Mandelson's privacy, raising questions about Starmer's full understanding.
• **Did Mandelson obtain STRAP clearance?** This higher-level clearance is required for access to top-secret intelligence material. It is unclear if Mandelson received this despite failing "developed vetting," or if he was granted access to sensitive files regardless. If mitigations were put in place that affected his ability to do the role, was Starmer aware?
• **What was the extent of Downing Street's due diligence?** Journalists reportedly raised concerns about Mandelson's vetting as early as September but were assured normal processes were followed. Details of No10's inquiries to the Foreign Office and their responses remain unknown.
• **Why was the then Foreign Secretary unaware?** David Lammy, who was in charge of the Foreign Office, stated he only learned of the debacle last Thursday, prompting questions about oversight, with Tory predecessor Sir James Cleverly suggesting it was Lammy's responsibility to know.
• **Was Sir Olly Robbins a 'fall guy' merely following orders?** Robbins himself told MPs in November that "it was clear that the Prime Minister wanted to make this appointment himself." This raises questions about whether Starmer or his then-chief of staff, Morgan McSweeney, insisted on Mandelson's appointment irrespective of any concerns raised.

The next 48 hours, particularly with Sir Olly Robbins' expected testimony to the foreign affairs committee tomorrow, will be crucial in determining the fate of Keir Starmer's leadership amidst this escalating political crisis.