In a significant and unexpected move, the US Supreme Court has delivered a temporary setback to former President Donald Trump's agenda, blocking his administration from deploying National Guard troops to Chicago. The unsigned order, issued on Tuesday 23 December 2025, prevents the use of military personnel to support federal immigration enforcement operations in Illinois.
A Rare Loss at the Conservative Court
The decision marks a notable departure from the court's recent trend. The nine-member bench, which holds a conservative majority, has granted the Trump administration nearly two dozen emergency appeals since his return to the White House. However, in this instance, the court refused to overturn lower court rulings that stood in the president's way.
The ruling saw conservative Chief Justice John Roberts, alongside Justices Amy Coney Barrett and Brett Kavanaugh, join the court's three liberal justices. Justices Samuel Alito, Neil Gorsuch, and Clarence Thomas were the sole dissenters. Kavanaugh wrote his own opinion concurring with the majority's judgment.
Legal Battle Over "Boots on the Ground"
The legal dispute centred on the administration's argument that deploying the National Guard was essential to protect federal personnel and property amid what it described as volatile protests against Trump's anti-immigration policies. The government contended that troops were necessary to execute federal immigration laws.
However, the Supreme Court justices were not persuaded at this preliminary stage. The order stated that the government "failed to identify a source of authority that would allow the military to execute the laws in Illinois." Federal law permits a president to invoke the National Guard in cases of rebellion or when unable to execute US laws with regular forces. The court interpreted "regular forces" as the standard US military and found the administration's justification lacking.
This conclusion upheld earlier decisions by Illinois District Judge April Perry and a federal appeals court. Judge Perry had earlier this year found "no credible evidence that there is a danger of rebellion" in the state and issued a restraining order against the deployment.
Broader Implications for National Guard Use
The Supreme Court's decision is likely to strengthen legal challenges against similar troop deployments in other American cities. The Trump administration has faced widespread resistance from state and local officials over using military force on domestic streets.
This case is part of a series of legal battles concerning the president's use of the National Guard, which one federal judge compared to an attempt to create a national police force. Parallel rulings have emerged across the country:
- A federal judge in Oregon has permanently blocked Guard members from supporting federal agents in Portland.
- A judge in California declared deployments in the Los Angeles area illegal.
- In Washington, D.C., Attorney General Brian Schwalb is leading a lawsuit, backed by nearly two dozen other states, to block hundreds of service members from patrolling the capital.
Meanwhile, the administration has continued to surge federal law enforcement agents into major metropolitan areas to advance its mass deportation campaign, sparking further protests and legal disputes over the use of riot control weapons and sweeping arrest tactics.
The Supreme Court's order remains in effect while the underlying legal challenge proceeds, leaving the door open for further deliberation on the limits of presidential power in domestic military deployments.
