Tea party candidate Milton Wolf’s chances of knocking off three-term Sen. Pat Roberts in Kansas have been complicated by renewed attention to an episode in the challenger’s past.

A Kansas newspaper recently reported that a state medical board is investigating Wolf’s posting of graphic X-ray images of patients’ wounds on his Facebook page in 2010. Wolf, a suburban Kansas City radiologist, has apologized for the postings, which came to light months ago.

Roberts’ campaign is blanketing the airwaves with ads questioning Wolf’s judgment. Wolf is continuing to call attention to the revelation that Roberts’ official residence in Kansas is rented space in a friend’s house. Wolf says Roberts is an example of a Washington insider who has lost touch with his home state. The GOP primary will be held Tuesday.