Channel 4 News has exclusively obtained a vast cache of data used by Donald Trump’s 2016 presidential 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.

Tonight, civil rights campaigners said the evidence amounted to a new form of voter “suppression” and called on Facebook to disclose ads and targeting information that has never been made public.

The ‘Deterrence’ project can be revealed after Channel 4 News obtained the database used by Trump’s digital campaign team – credited with helping deliver his shock victory to become president four years ago.

Vast in scale, it contains details on almost 200 million Americans, among more than 5,000 files, which together amass almost 5 terabytes of data – making it one of the biggest leaks in history.