"No election is conducted perfectly, and elections have all kinds of problems.We're going to have more problems because we're running an election during a pandemic." Election law expert Rick Hasen cautions that both campaigns could misconstrue honest mistakes in the administration of this week's national election as nefarious acts. The integrity of the election, he warns, could be compromised by human error and the unprecedented challenges posed by a once-in-a-lifetime pandemic. Hasen's especially concerned about key states like Pennsylvania, Wisconsin and Michigan. His conversation with Ian Bremmer is part of the latest episode of GZERO World.

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