MADISON, Wis. (AP) — When the elections clerk in Wisconsin's heavily Democratic capital city of Madison announced on Monday that duplicate absentee ballots had mistakenly been sent to around 2,000 voters, it ignited concerns about election integrity from a Republican congressman and others on the right.

The mailing of duplicate absentee ballots in Madison led a congressman to falsely suggest a clerk was lying about barcodes on the ballots.

Officials in Wisconsin have apologized after more than 2,000 voters in the state's capital city received duplicate absentee ballots in the mail. "This was a mistake," Madison city spokesperson Dylan Brogan said,

More than 2,000 voters in the Wisconsin capital city of Madison received duplicate absentee ballots in the mail, as the city admitted it "was a mistake."

Up to 2,000 voters in Wisconsin’s heavily Democratic capital of Madison were sent duplicate absentee ballots, but a city spokesperson says that none had been returned, all affected voters were being contacted and there were multiple safeguards in place to ensure only one ballot is counted.

As absentee voting gets into full swing in battleground Wisconsin, GOP Rep. Tom Tiffany is raising the alarm about what the state’s capital says is a clerical error that resulted in more than 2,000 voters receiving duplicate ballots in the city across multiple wards.