POTUS has many options, Anon:
10 U.S. Code § 8063
The National Security Act of 1947
10 U.S. Code § 252
10 U.S. Code § 253
10 U.S. Code § 12406
10 U.S.C. §§ 371-382. Section 371 specifically authorizes the armed forces to share information acquired during military operations and in fact encourages the armed forces to plan their activities with an eye to the production of incidental civilian benefits. The section allows the use of military undercover agents and the collection of intelligence concerning civilian activities only where there is a nexus to an underlying military purpose. Under sections 372 through 374, military equipment and facilities may be made available to civilian authorities; members of the armed forces may train civilian police on the operation and maintenance of equipment and may provide them with expert advice; and military personnel may be employed to maintain and operate the equipment supplied.