A group of Republican lawmakers may try to force the House to vote on whether to impeach IRS Commissioner John Koskinen, who they say has withheld information from Congress and has done a poor job reforming the embattled agency.

The House Freedom Caucus, a conservative faction, could bring up the impeachment measure as a privileged resolution by Thursday, when the House is scheduled to adjourn for the summer. The resolution isn’t on the leadership schedule now.