ACLU has filed a lawsuit against the NPS after the agency directed a protest group to remove Trump-related signs on the National Mall, arguing the move infringes on First Amendment protections. The National Mall has long been a site for political expression, and the NPS has historically allowed a range of signs and displays. The recent directive marks a shift in enforcement policy. The lawsuit could set a precedent for how federal agencies balance free speech with site management, potentially affecting future protest activities across national parks.