San Diego is suing the federal government for building razor wire fencing on city land near the Mexican border. The city argues the fence damages sensitive habitats and trespasses on city property. The lawsuit, filed January 5, names the Department of Homeland Security and Department of Defense, among others. San Diego claims U.S. Marines illegally entered city land in December to build the fences. The city seeks to stop further construction and affirm its land rights. The Department of Defense declined to comment, and Homeland Security hasn't responded. This case highlights ongoing tensions between California and federal authorities over immigration enforcement.