WICHITA, Kan. (AP) — The Republican primary fight for the U.S. House seat from south-central Kansas is heating up a notch with the filing of a citizen complaint to the Federal Election Commission.

The complaint alleges unlawful coordination between former congressman Todd Tiahrt’s campaign and a “super PAC” founded by a Wichita oilman who is supporting him. Tiahrt is challenging incumbent GOP congressman Mike Pompeo for the 4th Congressional District seat.

Tiahrt’s campaign manager on Thursday called the allegations “garbage” and a politically motivated attack.

The complaint was filed by bank executive Jane Deterding, a longtime Pompeo ally. She said Thursday she asked the Pompeo campaign for details needed to file the complaint.

Pompeo’s campaign says it’s glad the alleged coordination between Tiahrt and the PAC is coming to light.