Deputy Attorney General Rod Rosenstein’s ongoing battle with House Republicans reached new heights Tuesday, as the No. 2 senior leader of the Justice Department plans to call on the House to investigate its own committee staff.

Rosenstein has butted heads with House Intelligence Chairman Devin Nunes for months over a subpoena for documents related to the Russia investigation, but the battle spilled out into public view Tuesday after Fox News reported staff on the committee felt “personally attacked” at a meeting with Rosenstein in January.

Justice Department officials dispute the recounting of the closed-door meeting detailed in the story, and Rosenstein now plans to “request that the House general counsel conduct an internal investigation of these Congressional staffers’ conduct” when he returns from a foreign trip this week, a Justice Department official said.