TOPEKA, Kan. (AP) — The filing deadline for candidates seeking a spot on the Aug. 5. Kansas primary has passed with no additional Republicans joining the U.S. Senate race.

State Sen. Dennis Pyle did not file for the race by Monday’s noon deadline. The conservative Republican from Hiawatha spent the past few weeks gauging support for a potential challenge to incumbent GOP Sen. Pat Roberts.

Another Republican, Leawood radiologist Milton Wolf, filed to run against Roberts in January and is endorsed by tea party groups. Pyle had asked conservatives whether he should join the race, and if he or Wolf would be stronger competition for Roberts.

Numerous candidates did file for the state House of Representative. All 125 House districts are up for election this year.