In Iowa's State Senate, Republicans are introducing a bill that would require people to show photo ID when they vote.
The Senate Minority Leader says the law would protect the integrity of the voting system.
But, Senate Democrats argue that Iowa has little history of voter fraud, and a move like this would discourage voting by groups who typically favor Democrats, including immigrants, the elderly and the poor.
Republicans counter, saying the risk of voter fraud remains, and ID should be required.
The bill is modeled after similar legislation introduced by Secretary of State Matt Schultz.