Sens. Amy Klobuchar (D-Minn.) and Jon Tester (D-Mont.) want every state to offer same-day voter registration for federal elections.
The Democratic senators have reintroduced the Same Day Registration Act, which would require states to allow voters to register on the day of an election.
Ten states, plus the District of Columbia, currently allow eligible voters to do so, according to the National Conference of State Legislatures. In addition, the group notes that Illinois is expected to implement statewide same-day voter registration later this year.
Advocates argue it can help increase voter turnout, while opponents say it increases the chances for voting fraud.