Court Cases

The ACLU of Colorado filed a class-action lawsuit against the Trump administration to enjoin ICE from conducting warrantless arrests in Colorado without probable cause that the person is a flight risk and in the country without proper legal documentation. On November 25, 2025, a federal judge found ICE had unlawfully arrested each of the named plaintiffs, certified a class of similarly situated individuals, and enjoined ICE from arresting anyone in Colorado without a warrant without first making the probable cause findings required by law.

In a lawsuit brought against Colorado and Denver by the federal government, the ACLU of Colorado filed an amicus brief defending state and local laws that limit the diversion of their resources for the purpose of federal civil immigration enforcement. The brief argues that these laws are good policy, as they protect public safety and the functioning of state government, keep state actors within constitutional bounds, and promote the overall well-being of our communities and economy.

The ACLU of Colorado filed a class action lawsuit in federal court seeking to declare that ICE and DHS’s new practice of denying release on bond to groups of noncitizens violates federal law.