Their main focus is security, after Russians tried to hack into U.S. election systems in 2016. Intelligence officials have warned that similar attacks are likely in 2020, from either Russia or others intent on disrupting U.S. elections.
Federal, state and local authorities are trying to improve the security of the nation's voting systems before that happens. One way they're doing that is by purchasing more machines that produce paper ballots, which can be used to verify results in the event of a cyberattack on electronic systems.
The Brennan Center for Justice estimates that nearly 90 percent of Americans will cast their ballots on paper-based systems in 2020, compared with 80 percent in 2016.
That still means about 16 million voters will use paperless machines.