Mississippi State Sen. Chris McDaniel’s (R) campaign announced Thursday that they are offering 15 rewards of $1,000 each for people who can bring evidence that leads to the arrest and conviction of people involved in voter fraud in the Mississippi Republican runoff for U.S. Senate between McDaniel and Sen. Thad Cochran (R-MS), who won the runoff.

McDaniel’s Senate campaign announced the reward in an email as part of his newly launched “Election Integrity Challenge and Voter Fraud Reward.”

“The Challenge is aimed at funding fifteen $1,000 rewards which will be paid to individuals who provide evidence leading to the arrest and conviction of anyone involved in voter fraud on or leading up to the June 24, 2014, Republican primary runoff election in Mississippi,” the announcement on Thursday said.

The reward comes as McDaniel’s campaign says it has found more evidence of rampant misconduct and voter fraud in the runoff election.

McDaniel and his supporters argue that the state senator is actually the rightful winner of the Republican primary and Cochran only won through foul play, partially by recruiting African-Americans and Democrats to vote for the incumbent senator.