This bill, known as the PATROL Act, aims to restrict the Department of Justice's ability to pursue legal action against states for certain border security measures. It specifically prohibits the Attorney General from initiating or maintaining civil actions against a state under sections 9 or 10 of the Act of March 3, 1899 , which typically address obstructions to navigable waters. This prohibition applies when a state constructs or installs a physical barrier , such as a wall, fence, or floating buoy, along its international border. The purpose of these barriers must be to prevent individuals from entering the state in violation of immigration laws or to protect the state's territory. This measure would apply to both new and existing civil actions.