TOPEKA, Kan. (AP) — After losing his primary last month, Kansas congressman Tim Huelskamp is back in Washington, D.C., and pushing to have the commissioner of the Internal Revenue Service impeached.

The Wichita Eagle reports that Rep. Huelskamp and others in the House had been pushing to open impeachment proceedings against Commissioner John Koskinen since January. Koskinen is accused of thwarting congressional investigations into the IRS’s tough scrutiny of tea party groups seeking tax exemptions.

“Congress must decide: does it stand with the #IRS or with the American people?” https://t.co/E6HQ3n5dxC

— Cong. Tim Huelskamp (@CongHuelskamp) September 14, 2016

GOP leaders reached a compromise and have summoned Koskinen to testify at a hearing next week in exchange for postponing any impeachment vote.

Huelskamp lost to Roger Marshall, an obstetrician, on Aug. 2.