The election board in the home county of Democratic Sen. Joe Donnelly wants an investigation into whether Republican candidate Mike Brain filed bogus signatures to get on the primary ballot.
The St. Joseph County Election Board, composed of two Democrats and one Republican, voted unanimously Thursday to ask the county prosecutor, Indiana State Police and the Indiana attorney general for the investigation after its review of signatures allegedly found discrepancies, including petition signers who were not registered voters, the South Bend Tribune reported.
State law requires Senate candidates to submit signatures of at least 500 registered voters from each of Indiana's nine congressional districts.
Braun, a Jasper businessman, is one of three Republicans vying to challenge Donnelly in the November general election.
"It comes as little surprise that Democrats in Joe Donnelly's home town are launching politically motivated attacks," Braun spokesman Josh Kelley said.
Donnelly, a University of Notre Dame graduate, formerly practiced law in South Bend. He served on the Indiana State Election Board from 1988 to 1989.