When Professor David Carroll asked for Cambridge Analytica to release the information they held about him, it led to a legal battle and his story being documented in the 'The Great Hack' documentary.

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After a four-year battle we were able to finally reveal his data to him as part of our #DeterringDemocracy investigation. Channel 4 News exclusively obtained a vast cache of data used by Donald Trump’s 2016 presidential campaign on almost 200 million American voters, including David Carroll.

You can watch the first part of our exclusive #DeterringDemocracy investigation here:    • Revealed: Trump campaign strategy to ...