Mail-In Voting Could Deliver Chaos

If the 2000 election provoked a constitutional crisis, the 2020 one is flirting with disaster. Debate over voting by mail has focused mostly on the potential for fraud and logistical difficulties. But there are also legal problems with it, which carry the seeds of chaos before Inauguration Day and continuing instability after.

Under federal law, the presidential election must take place on Nov. 3, and the electors chosen on that day must vote on Dec. 14 to select the new president and vice president. These dates can’t be changed…