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 Representative 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. 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 his primary race to Roger Marshall, an obstetrician, on August 2.