'Atlantic' writer Barton Gellman says the 2020 election could trigger a constitutional crisis, and if the election is close, it could take weeks to determine the results in key battleground states as mail-in ballots are scrutinized for technical flaws and counted. If President Trump cries fraud and his supporters take to the streets, state legislatures could resolve to set aside the popular vote in their states and choose their own partisan delegations to the Electoral College. "This is not going to be a normal election. ... Preserving its legitimacy is going to take extra effort," he says.