New details are emerging about how the shadowy data firm Cambridge Analytica worked to manipulate voters across the globe, from the 2016 election in the United States to the Brexit campaign in Britain and elections in over 60 other countries, including Malaysia, Kenya and Brazil.

Emma Briant, an academic expert on disinformation at George Washington University, has unearthed new e-mails that appear to reveal the earliest documented role played by Bannon in Brexit.