In this video, we explain the key facts behind Channel 4 News’ investigation into the tactics of the Donald Trump 2016 presidential campaign – and why this is the latest battleground in the fight for voting rights.

Channel 4 News has exclusively obtained a vast cache of data used by Trump’s 2016 campaign on almost 200 million American voters. It reveals that 3.5 million Black Americans were categorised by Donald Trump’s campaign as ‘Deterrence’ – voters they wanted to stay home on election day.

Investigations Team: Job Rabkin, Guy Basnett, Ed Howker, Janet Eastham and Heidi Pett. News Production Team: Sola Renner, Michael French, Josh Ho, Matthew Cundall, Tim Bentham, Tony Fryer, Dani Isdale and Anna-Lisa Fuglesang.

Explained: How Trump’s strategy to deter 3.5m Black Americans from voting worked in 2016