A woman walks out of the Internal Revenue Service building in New York

The IRS official who led the tax-exempt organizations unit when Tea Party groups were targeted is now in charge of the IRS office responsible for ObamaCare, two Capitol Hill sources told Fox News.

The acknowledgement comes after the administration announced that the official’s successor — who had only been on the job a few days — would be retiring. And it fueled criticism of the agency, as the outgoing IRS commissioner prepared to face lawmakers’ questions at a hearing Friday morning.

“Stunning. Just stunning,” Senate Republican Leader Mitch McConnell said in reaction to the latest development.