The Obama administration will face more questions over its role in the IRS scandal next week when a top Treasury Department official will testify before the House Oversight and Government Reform Committee.

Deputy Treasury Secretary Neal Wolin will appear at a panel hearing on Wednesday, a committee aide tells POLITICO. He’ll testify alongside J. Russell George, the IRS inspector general who released a damaging report this week that slammed lax management at the agency.

IRS commissioners technically report to the deputy Treasury secretary so Wolin’s testimony will provide important insight into what the administration knew about the agency’s practice of subjecting conservative groups to extra scrutiny as they applied for a tax exemption.