Republican presidential nominee Donald Trump greets British politician Nigel Farage during a campaign rally in Jackson, Miss., on Aug. 24, 2016. Journalist Carole Cadwalladr says "there are so many overlaps" between Russia, the Trump campaign and the Brexit vote. Jonathan Bachman/Getty Images
The Guardian'sCarole Cadwalladr's investigation into Cambridge Analytica's role in Brexit has led her to Russian connections and the Trump campaign. She says British investigators are now "working very closely with the FBI."
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