Justice Department lawyer in Z Street case a potential witness

The Wall Street Journal reports that the lawyer who until recently was representing the Justice Department in the Z Street lawsuit is a potential witness due to his tenure in the IRS working under Lois Lerner.

From
August 2008 until August 2010, Mr. Strelka was a presidential
management fellow assigned to the IRS Exempt Organizations division.
That's the same period that Z Street says it