JM 4-1.420
No suit may be brought on behalf of the government, absent an unusual express statutory authorization, except by the Attorney General or an attorney under his/her supervision. See Sutherland v. International Ins. Co., supra; E.O. 6166 § 5, June 10, 1933. Accordingly, in matters assigned to United States Attorneys for handling, the responsibility is that of the United States Attorney, and that responsibility may not be delegated to agency counsel.
The same principles apply when the government (through government corporations or the Maritime Administration) enjoys the benefit of insurance. Underwriters may nominate trial counsel. However, such trial attorneys are only "of counsel" to the United States Attorney. They do not control or direct the conduct of cases, which must remain with the United States Attorney. The United States Attorney or one of his/her assistants should monitor the course of such litigation carefully.
[updated April 2018]