British courts may unlock secrets of how Trump campaign profiled US voters

Legal mechanism may help academic expose how Big Data firms like Cambridge Analytica and Facebook get their information

A US professor is trying to reclaim his personal data from the controversial analytics firm that helped Donald Trump to power. In what legal experts say may be a "watershed" case, a US citizen is using British laws to try to discover how he was profiled and potentially targeted by the Trump campaign.

David Carroll, an associate professor at Parsons School of Design in New York, has discovered a transatlantic legal mechanism that he hopes will give him access to information being sought by both the FBI and the Senate intelligence committee. In recent weeks, investigators looking at how people acting on behalf of Russia targeted American voters have focused on Trump's data operation. But although the FBI obtained a court order against Facebook to make it disclose evidence, the exact way in which US citizens were profiled and targeted remains largely unknown.