More people than ever are returning their ballots by mail or dropping them off at a local election location rather than voting in a booth on Election Day.
While that makes voting easier, the trend is raising concerns about whether those voters can be assured their ballots will count.
Voting rights activists want to ensure that voters are given a reasonable chance to fix any problems.
Earlier this month, the ACLU and other groups filed lawsuits in Georgia after an Atlanta-area county reported a comparatively high rate of rejected absentee ballots during the start of early voting. Those actions followed similar lawsuits in New Hampshire and California.
In 2016, nearly one of every four ballots cast came through the mail or was handed in at a drop-off location.