Brittany Kaiser, a former Cambridge Analytica director turned witness in a cross-Atlantic data privacy scandal, on Tuesday praised Twitter's move to ban political advertising from its platform but said it was not a "permanent fix.

She said voters in the United States and Britain were today as likely to be affected by data breaches as they were in 2016 during Donald Trump's presidential campaign and Britain's EU referendum campaign.

Cambridge Analytica, the political consultancy at the center of a scandal involving data harvested via Facebook, assisted Trump's 2016 presidential campaign and the Leave campaign in Britain.