 As this operation proliferates, we've been looking into who's behind it and asking just how it might affect a close presidential race later this year. I'm joined today by Cheyenne Sadarizadeh, who works for BBC Verify. For the past few months, we, along with our colleagues Olga Robinson and Paul Myers, have been investigating this network. And we've tracked down a key player, a former US Marine and Florida police officer who fled to Russia in 2016. For me, it's a game and a little payback.