MPs sitting opposite Sir Keir Starmer burst into howls of laughter after the Prime Minister described the facts of Lord Mandelson's security vetting as "incredible".
Sir Keir looked ashen-faced as he briefly stared down MPs who were then heckling his comments.
The Prime Minister said: “I know many members across the House will find these facts to be incredible.”
After the chorus of laughter died down, Sir Keir added: “To that, I can only say they are right.
"It beggars belief that throughout the whole timeline of events, officials in the Foreign Office saw fit to withhold this information from the most senior ministers in our system in Government.
“That is not how the vast majority of people in this country expect politics, Government or accountability to work.”
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