Can the president deploy soldiers on American streets? That is the question now before a California court. A landmark trial in San Francisco will determine if President Trump’s June deployment of California National Guard troops and U.S. Marines to Los Angeles violated federal law and constitutional safeguards, particularly the 1878 Posse Comitatus Act.
In June 2025, President Trump federalized about 4,000 California National Guard members and deployed 700 Marines to Los Angeles following anti-ICE immigration raids and protests. The move happened without Governor Gavin Newsom’s consent, sparking a major legal battle over limits on presidential power. California quickly filed a lawsuit, claiming the action broke federal law and undermined constitutional protections.
Passed in 1878, the Posse Comitatus Act limits the use of federal military forces for domestic law enforcement unless specifically authorized by Congress. California argues that sending federal troops to assist in policing violated this law.
California also points to the Tenth Amendment, which reserves certain powers to the states. The lawsuit claims that federalizing the National Guard without the governor’s approval infringed on state sovereignty and the anti-commandeering principle.
The federal government cites this statute, which allows the president to federalize the National Guard during situations of “rebellion” or when it is necessary to enforce U.S. laws. The administration argues that the protests met these conditions.
The trial is being heard by Judge Charles Breyer in a non-jury format. California claims that the troops were not limited to protecting federal property but actively supported immigration enforcement, assisted with detentions, and took part in crowd control.
Judge Breyer has previously ruled in favor of California in preliminary decisions, suggesting that the deployment may have violated the Tenth Amendment. However, the Ninth Circuit Court temporarily blocked California from regaining full control of its Guard units, keeping a portion of them under federal authority during the trial.
The outcome will set a precedent for how and when a president can deploy military forces domestically, particularly in states that oppose such action. A ruling for California could significantly limit the executive branch’s authority in this area. Conversely, a ruling for the federal government could expand presidential power in future domestic crises.
The case also reflects broader tensions over the role of the military inside the United States. In recent months, the administration has increased its use of National Guard forces in various cities, sometimes without local consent, raising concerns among civil liberties advocates.
The trial is expected to last three days, with testimony from Department of Homeland Security officials, military commanders, and law enforcement officers. Around 250–300 National Guard members remain under federal control in California during the proceedings.
A ruling is expected soon after the trial concludes, and whichever side loses will likely appeal, potentially sending the case to the U.S. Supreme Court.
The deployment and subsequent lawsuit have divided public opinion. Supporters of the president argue that the military presence was necessary to maintain order and protect federal facilities. Critics contend that the move was an abuse of power and a dangerous precedent for civil liberties.
Legal scholars note that the case is unusual in its scale and scope. While the military has been used domestically in emergencies before—such as natural disasters—deployments for law enforcement purposes remain rare and controversial.
The Posse Comitatus Act was enacted after the Reconstruction era to limit federal troops’ involvement in civilian affairs. Over the years, exceptions have been made, such as the use of the military to enforce civil rights laws in the 1950s and 1960s. However, these exceptions have generally involved clear legal authorization from Congress.
Presidential authority over the National Guard has also been a recurring point of contention. Federalization has occurred in cases like the 1992 Los Angeles riots, but typically with state cooperation. The current dispute stands out because of the lack of consent from California’s governor.
The decision in this case will likely influence how future administrations handle domestic unrest. It may also prompt Congress to revisit the balance of power between the federal government and the states regarding military deployments.
For now, the question remains unresolved: Can the president deploy soldiers on American streets without state approval? The answer will depend on how the court interprets a mix of constitutional principles, historical precedent, and modern security concerns.
The California court’s decision will have far-reaching implications for the separation of powers, civil liberties, and the relationship between the states and the federal government. As the trial unfolds, the nation is watching closely to see whether the judiciary will place firm limits on presidential authority or affirm a broad interpretation of executive power in times of domestic unrest.
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