The United States Supreme Court has blocked President Donald Trump's attempt to deploy National Guard troops on the streets of Chicago, dealing a setback to his immigration enforcement efforts. The court, which has a conservative majority, upheld a lower court's order that prevents the deployment, stating that the government had not identified a legal basis for using military forces to enforce laws in Illinois. Three justices dissented from the decision.

Trump has previously sent National Guard troops to other cities led by Democrats, but similar efforts in Chicago and Portland have faced legal challenges. The White House responded by emphasizing that the president's core agenda to protect federal property remains unchanged despite the ruling. It is uncertain how this decision will impact other ongoing cases regarding troop deployments in Democratic-led states.

Currently, about 300 National Guard troops are activated in the Chicago area, but they are not participating in operations.