INDIANAPOLIS (AP) — The Indiana Election Commission is set to hear a challenge to U.S. Rep. Todd Young’s place on the ballot for Indiana’s open U.S. Senate seat.

State law requires Senate candidates to submit signatures from 500 registered voters from each of Indiana’s nine congressional districts to qualify for the May primary ballot.

The state Election Division reported Young had 501 signatures in the 1st Congressional District, but state Democrats say he was actually two short. An Associated Press analysis of Young’s petitions found he was three signatures short.

Young will stay on the Indiana ballot unless three of the four commission members vote to remove him.

Any decision from the hearing can also be challenged in court.