A federal judge ruled Sunday that Iowa Secretary of State Paul Pate can continue with his plan to challenge the ballots of voters who appear on a flawed list of more than 2,000 people, most of whom were wrongly flagged as potential noncitizens.

U.S. District Judge Stephen Locher wrote Sunday that both sides seem to agree that some portion of the people on the list are not U.S. citizens.

An Iowa judge on Sunday ruled that the state can challenge thousands of ballots to be potentially cast in Tuesday's presidential election by residents who had once identified themselves noncitizens, a move that voting advocates see as an attempt to disenfranchise naturalized citizens.

A federal judge is allowing the Iowa Secretary of State's order to election officials to question the validity of thousands of Iowans' ability to cast a vote to

Iowa officials can challenge the ballots of 2,176 registered voters they believe may not be U.S. citizens, a federal judge ruled days before Election Day on Sunday. Why it matters: Iowa Secretary of State Paul Pate said he's working to ensure the election's integrity,