INDIANAPOLIS (AP): The GOP primary field for Indiana’s open U.S. Senate seat is set after U.S. Rep. Marlin Stutzman opted not to challenge his rival’s candidacy in court.

The deadline to file a court challenge passed this week and Stutzman’s campaign confirmed Tuesday that it will not further challenge U.S. Rep. Todd Young’s placement on the May 3 primary ballot.

Stutzman found himself in the odd position of appearing before the Indiana Election Commission alongside Democrats last month in a failed bid to oust Young for not submitting enough voter petition signatures to qualify.

Indiana law requires Senate candidates to gather 500 voter petition signatures from each congressional district. An Associated Press analysis of Young’s petitions found he was three signatures short in northwest Indiana’s 1st Congressional District.