50 CFR 300.303: Port access by foreign, listed IUU vessels.

If a foreign, listed IUU vessel is allowed to enter a port or place subject to the jurisdiction of the United States, the Assistant Administrator may, in accordance with applicable provisions of RFMO conservation and management measures, take one or more of the following actions:

(a) Inspect the vessel;

(b) Deny the vessel access to port services, including but not limited to refueling, resupplying, or disembarking or embarking of crew; or

(c) Prohibit the vessel from engaging in commercial transactions including, but not limited to, transshipping or landing product.