On September 2, 2025, a federal judge ruled that President Donald Trump’s deployment of National Guard and Marines in Los Angeles violated the Posse Comitatus Act of 1878, which prohibits military forces from performing civilian law enforcement duties. The decision marks a significant setback for Trump’s immigration enforcement strategy.
In June 2025, Donald Trump deployed 4,000 National Guard troops and 700 Marines to Los Angeles to address protests against immigration raids. The state of California challenged this action, arguing it infringed on state sovereignty and violated federal law. Judge Charles Breyer, in a San Francisco court, ruled that Trump’s actions were illegal, citing the Posse Comitatus Act. The injunction prevents Trump from using troops for arrests, searches, or crowd control in California.
The Posse Comitatus Act bars the military from domestic law enforcement unless explicitly authorized by Congress. Breyer’s ruling emphasized that the protests did not constitute a rebellion, and local law enforcement was capable of handling the situation. The decision is stayed until September 12, allowing Trump’s administration time to appeal.
Donald Trump has considered similar military deployments in cities like Chicago and San Francisco, raising concerns about a national police force under his control. California’s Governor celebrated the ruling, stating it upholds democracy and state rights against Trump’s overreach.
Impact and Outlook
The ruling limits Donald Trump’s ability to use federal troops for domestic law enforcement in California, setting a precedent for other states. As Trump pushes his immigration agenda, further legal battles may arise if similar deployments are attempted elsewhere.
