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28 U.S. Code § 509 - Functions of the Attorney General
All functions of other officers of the Department of Justice and all functions of agencies and employees of the Department of Justice are vested in the Attorney General except the functions—
(1) vested by subchapter II of chapter 5 of title 5 in administrative law judges employed by the Department of Justice;
(2) of the Federal Prison Industries, Inc.; and
(3) of the Board of Directors and officers of the Federal Prison Industries, Inc.
https://www.law.cornell.edu/uscode/text/28/509

28 U.S. Code § 510 - Delegation of authority 510
The Attorney General may from time to time make such provisions as he considers appropriate authorizing the performance by any other officer, employee, or agency of the Department of Justice of any function of the Attorney General.
https://www.law.cornell.edu/uscode/text/28/510

28 U.S. Code § 515 - Authority for legal proceedings; commission, oath, and salary for special attorneys
(a) The Attorney General or any other officer of the Department of Justice, or any attorney specially appointed by the Attorney General under law, may, when specifically directed by the Attorney General, conduct any kind of legal proceeding, civil or criminal, including grand jury proceedings and proceedings before committing magistrate judges, which United States attorneys are authorized by law to conduct, whether or not he is a resident of the district in which the proceeding is brought.
(b) Each attorney specially retained under authority of the Department of Justice shall be commissioned as special assistant to the Attorney General or special attorney, and shall take the oath required by law. Foreign counsel employed in special cases are not required to take the oath. The Attorney General shall fix the annual salary of a special assistant or special attorney.
https://www.law.cornell.edu/uscode/text/28/515

28 U.S. Code § 533 - Investigative and other officials; appointment
The Attorney General may appoint officials—
(1) to detect and prosecute crimes against the United States;
(2) to assist in the protection of the person of the President; and [1]
(3) to assist in the protection of the person of the Attorney General.[2]
(4) to conduct such other investigations regarding official matters under the control of the Department of Justice and the Department of State as may be directed by the Attorney General.
This section does not limit the authority of departments and agencies to investigate crimes against the United States when investigative jurisdiction has been assigned by law to such departments and agencies.
https://law.justia.com/codes/us/1997/title28/partii/chap33/sec533

28 CFR § 600.4 - Jurisdiction.
(a) Original jurisdiction. The jurisdiction of a Special Counsel shall be established by the Attorney General. The Special Counsel will be provided with a specific factual statement of the matter to be investigated. The jurisdiction of a Special Counsel shall also include the authority to investigate and prosecute federal crimes committed in the course of, and with intent to interfere with, the Special Counsel's investigation, such as perjury, obstruction of justice, destruction of evidence, and intimidation of witnesses; and to conduct appeals arising out of the matter being investigated and/or prosecuted.
https://www.law.cornell.edu/cfr/text/28/600.4

Donald J Trump v. United States, No. 9:22-CV-81294-AMC
https://www.courtlistener.com/docket/64911367/trump-v-united-states/