Acting IRS Commissioner Danny Werfel (right) talks with House Oversight and Government Reform Committee Chairman Rep. Darrell E. Issa, California Republican, prior to testifying before the committee on Thursday. (Associated Press)

Acting IRS Commissioner Danny Werfel (right) talks with House Oversight and Government Reform Committee Chairman Rep. Darrell E. Issa, California Republican, prior to testifying before the committee on Thursday. (Associated Press)