IRS attorneys will be even busier than normal next week, because another federal judge has told them to show up in court July 11 to defend the federal tax agency.

They will have to explain to U.S. District Court Judge Reggie Walton why the IRS shouldn't be required to let an outside expert evaluate whether emails on the computer hard drives of former IRS official Lois Lerner and six colleagues really are lost forever, as the agency recently told Congress.

Responding to a motion filed Monday by True the Vote, a Houston-based conservative nonprofit at the center of IRS targeting during the 2010 and 2012 campaigns, Walton issued an order Tuesday to hear arguments next week.

The IRS recently told Congress that a mysterious crash of the hard drives last year irretrievably destroyed nearly two years of emails to and from Lerner and the others to and from people in other federal agencies, including the White House.

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