Allegations of election interference have dominated the narrative throughout Donald Trump’s presidency. As another election approaches, The Telegraph’s US Editor, Ben Riley-Smith looks back at what happened in 2016. He finds threads that repeatedly run through the UK, but were never fully explored - from crucial London meetings, to a Cambridge University don turned FBI informant, to the flat, just round the corner from Harrods, where a computer geek managed to upend the election by publishing private Democratic emails.

But why does Britain keep coming up? How exactly does foreign interference happen? And what does this tell us about how Donald Trump’s campaigns work?

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Episode 1: The Bomb

The Russia investigation only began thanks to a pair of London meetings. One saw a Trump adviser meet a mysterious professor. The other involved an Aussie diplomat. Those present reveal what happened, including someone who has never been heard before.