Counsel for the United States
(1) “Counsel for the United States” means— (A) a United States attorney, an assistant United States attorney designated to act on behalf of the United States attorney, or an attorney with the United States Department of Justice or with a Federal agency who has litigation authority; and (B) any private attorney authorized by contract made in accordance with section 3718 of title 31 to conduct litigation for collection of debts on behalf of the United States.