(NBC News) Former Internal Revenue Service Commissioner Douglas Shulman told Senators Tuesday that he wasn't informed or involved in the agency's targeting of Tea Party groups.
"I certainly am not personally responsible," Shulman testified.
From 2010 to 2012 irs agents based in Cincinnati targeted conservative groups and delayed granting them non-profit status.
Shulman says someone should have told him, no one did, and he doesn't know why.
"With that said, this happened on my watch and I very much regret that happened on my watch," he added.
Senators are furious that Shulman and Steven Miller, who ran the IRS after Shulman left in late 2012, kept the scandal quiet after they did learn about it, not telling Congress in an election year.
"Mr. Miller, that's lie by omission," alleged Utah Senator Orrin Hatch.
"I did not lie, sir," Miller replied.
Miller has been forced out by the president; the IRS is getting a new boss, and Treasury Secretary Jack Lew vowed a top to bottom review of the agency.
"We're going to make sure that nothing like this ever happens again," Lew promised.
-- Steve Handelsman, NBC News, reports