A key ally of former Secretary of State Hillary Clinton will testify before the House Select Committee on Benghazi this month.

The Benghazi panel announced Friday that Sidney Blumenthal will appear before the committee on June 16 to answer questions about memos he drafted on Libya when Clinton ran the State Department.

The interview will be closed to the public.

“This appearance before the Select Committee on Benghazi involves a witness deposition, which is typically done in private,” according to an advisory from the committee. “The session will be closed to the media.”