The U.S. Supreme Court on Tuesday rejected President Donald Trump’s request to lift a lower-court injunction blocking the deployment of National Guard troops in Chicago and elsewhere in Illinois to support federal immigration enforcement.

In an unsigned order, the court said the president had “failed to identify a source of authority that would allow the military to execute the laws in Illinois.” The decision leaves in place a lower court ruling that prevents the administration from deploying approximately 300 members of the Illinois National Guard while legal challenges proceed.

The ruling, which appeared to be decided by a 6–3 vote, effectively halts the Guard deployment intended to assist federal immigration agents and protect federal property in Chicago. Legal analysts said the decision could also raise questions about the legality of similar National Guard deployments ordered by Trump in other states as part of his broader immigration crackdown. The ruling is not expected to affect National Guard activity in Washington, D.C., due to the district’s unique federal status.

Justices Samuel Alito, Clarence Thomas, and Neil Gorsuch dissented.

The White House said the ruling does not undermine the administration’s broader objectives. In a statement, White House spokesperson Abigail Jackson said Trump activated the National Guard to protect federal law enforcement officers and prevent damage to federal buildings and property.

“Nothing in today’s ruling detracts from that core agenda,” Jackson said.

Illinois Gov. JB Pritzker welcomed the court’s decision, calling it a check on what he described as executive overreach.

“This is an important step in curbing the Trump administration’s consistent abuse of power and slowing Trump’s march toward authoritarianism,” Pritzker said in a series of posts on X. He added that communities should not live in fear of military deployments or aggressive immigration enforcement on local streets.