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MI5 chief warns against overstating Russian interference in Brexit vote

Sir Ken McCallum said Russia tried to sway the vote, but he called the effort comparatively unimpressive and warned against amplifying it.

  • MI5 chief Sir Ken McCallum warned on Wednesday against fueling Russian propaganda efforts after Prime Minister Andy Burnham claimed Moscow interfered in the 2016 Brexit referendum.
  • Prime Minister Andy Burnham provoked backlash Monday by stating it was "clear" Moscow sought to interfere in 2016, though he denied Conservative leader Kemi Badenoch's claims he questioned the referendum's legitimacy.
  • Distinguishing between interference attempts and outcomes, Sir Ken agreed "strongly" with the Prime Minister regarding a 2019 election hack while citing Russian media involvement as "openly on the record" in 2016.
  • Reform UK leader Nigel Farage accused Burnham of lying, while former Prime Minister Boris Johnson cited security briefings finding no evidence of "successful interference" in 2016; Conservative deputy leader Alex Burghart branded Sir Ken's comments an "extraordinary slap down."
  • Warning that amplifying trolls helps adversaries divide the public, Sir Ken noted a 2020 parliamentary report criticized the government for failing to counter Russian social media threats, urging against making these accounts look "10ft tall.
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MI5 director confirmed Prime Minister Burnham's statements about Kremlin interference in the referendum, although he said he did not influence the outcome

·Vicente López, Argentina
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Daily Express broke the news in London, United Kingdom on Tuesday, October 13, 2026.
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