UK Security Chief Cautions Against Overstating Russian Interference in Brexit Vote

The head of Britain's domestic security service, MI5, has stated that while Russian interference occurred during the 2016 Brexit referendum, its impact on the outcome should not be overstated.

Sir Ken McCallum addressed the issue following comments from Prime Minister Andy Burnham, who had suggested it was "clear" that Moscow interfered in the vote. Sir Ken confirmed that it is a "matter of public record" that online trolls and bots were involved in attempted interference.

However, he expressed concern about amplifying the perceived effectiveness of these efforts, noting that Russian trolls would likely be "delighted" to be prominent in the news again. "There is a really important difference between interference attempted and outcome swayed," Sir Ken stated, adding, "I am a little bit anxious that we don't play into our adversaries' hands by making these trolls look 10ft tall."

Conservative officials criticized Burnham's initial statements. Deputy leader Alex Burghart described Sir Ken's remarks as an "extraordinary slap down" to the Prime Minister. Burnham, in a podcast interview, had asserted that upon entering Downing Street, he received confirmation of Russian interference in the 2016 vote.

When pressed on the matter in Parliament, Burnham appeared less definitive, and a spokesperson for Number 10 clarified that while the Prime Minister believed Russia likely attempted to influence the referendum result, he did not believe those efforts were successful. The Conservative party accused Burnham of an "embarrassing retreat" and attempting to question the legitimacy of the referendum result.

Sir Ken elaborated on the public record, mentioning that "Russia Today and Sputnik and other Russian media organisations came in pretty strongly around the referendum." He also confirmed "a certain amount of interference attempted through trolls and bots and so forth."

He agreed with the Prime Minister regarding a hack-and-leak incident during the 2019 general election campaign but reiterated his concerns about the public discourse surrounding interference. "It is kind of up to us how far we allow our various adversaries to divide us," he said. "And I'm a little bit worried that if we all stay in this debate for another few days, that Russian trolls who didn't appear to do all that much at various points over the years, they'll be delighted because they are front page news again despite the comparative unimpressiveness of what they do at all points along the journey."

Earlier, Reform UK leader Nigel Farage had accused Burnham of lying, asserting "no Russian interference" in the referendum. Former Prime Minister Boris Johnson also commented, stating that security services informed him in 2016 that there was "no evidence of any successful interference in the 2016 referendum, by Russia or any other power." Johnson suggested that either the security services' view had changed, which he deemed unlikely, or Burnham was misrepresenting what he was told.

A 2020 parliamentary report did not reach a definitive conclusion on whether Russia had attempted to intervene in UK elections and referendums but did criticize the government for not fully assessing and countering the threat posed by Russian social media accounts.