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.

MADISON, Wis. (AP) — The Wisconsin Supreme Court ruled Friday that Robert F. Kennedy Jr.’s name will remain on the state’s presidential ballot, upholding a lower court’s ruling that candidates can only be removed from the ballot if they die.

The change comes as the former president has faced heightened threats in recent months. He was wounded in an assassination attempt at an outdoor rally in Pennsylvania in July, and Secret Service agents this month stopped a second apparent attempt on Trump’s life at his golf course in Florida.

MADISON, Wis. (AP) — The Wisconsin Supreme Court ruled Friday that Robert F. Kennedy Jr.'s name will remain on the state's presidential ballot, upholding a lower court's ruling that candidates can only be removed from the ballot if they die.

Gwen Waltz's visit to Wisconsin came after surrogates for former President Donald Trump's campaign wrapped up a three-day bus tour in the state.

A Wisconsin district attorney said Thursday that her office is pursuing an investigation into the removal of an absentee ballot drop box by the mayor of Wausau.

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.

Mayor Doug Diny of Wausau, Wis., said the City Council should have been consulted before the installation. The Wisconsin Supreme Court had said authority rested with the city clerk.

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,

The decision marks the latest twist in Kennedy’s quest to get his name off ballots in key battleground states where the presidential race is close.

Do Something, a national nonprofit, is hosting a series of voter registration events with giveaways and celebrity guests in Wisconsin.