This legislation aims to enhance national security by amending title 46, United States Code, to impose restrictions on contracts for port operations and management. It specifically targets the involvement of certain foreign entities in critical port infrastructure. Under the bill's provisions, an owner or operator of a facility requiring a security plan is prohibited from entering into contracts for the ownership, leasing, or operation of that facility. These restrictions apply to state-owned enterprises of China, Russia, North Korea, or Iran. Additionally, the prohibition extends to any foreign entity that has even a partial ownership stake by one of these designated countries, thereby preventing potential influence from foreign adversaries over vital U.S. port assets.