Russia, Iran & China are all planning to disrupt the US election via online disinformation, according to the head of Microsoft Threat Analysis (MTAC).
Analysts at MTAC advise governments, like US, as well as private companies about variety of digital attempts to destabilise democracy in different countries.
BBC correspondent Marc Cieslak is in New York, looking behind the scenes of the high-security facility monitoring digital threats ahead of the US election.
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