"If [the election] is very close and it ends up in the courts, that kind of protracted situation I think will lead many Americans to believe that it was an unfair election." Rick Hasen, election law expert and author of Election Meltdown, lays out some of the worst-case scenarios for Election Day, ranging from unprecedented voter suppression to dirty tricks by foreign actors. The conversation was part of the latest episode of GZERO World with Ian Bremmer. The episode begins airing nationally in the US on public television this Friday, October 30. Check local listings.

Watch the episode: What could go wrong in the US election? Rick Hasen on nightmare scenarios & challenges