“The problem is, we don’t have a plan for what happens if a part of the country faces a disruption on a presidential Election Day,” said Rick Hasen, an election law expert at the University of California, Irvine’s law school. He said Congress should be considering legislation that would address potential voting trouble. “What if one part of the country is affected, if it’s California or Florida?” he said. “The closer we get to the election, the harder it’s going to be to come up with rules that look fair.”