He.needs to drag in ALL the IT people that have any role in building, implementing and supporting the IRS email system with a notice of the intent to arrest anyone that conspires, commits perjury or attempts to cover up any effort to hide or destroy any email.
Then follow thru with it. He also needs to bring Contempt charges for lying against kaskinen who said they would provide ALL of lerners emails when it has now come out that they knew in February the emails were supposedly missing
Tie up the IRS in paper work. Knock them over the head with their own rule book.