The fight over immigration enforcement has landed squarely in the Front Range. On Wednesday, the Republican-led House Judiciary Committee opened a formal review of Denver and Boulder's limits on cooperation with U.S. Immigration and Customs Enforcement, sending document demand letters to local law enforcement agencies and prosecutors. The inquiry drops into already tense debates over surveillance data, city policies, and whether local authorities should honor ICE detainers, and it gives both cities a tight turnaround to hand over records.
According to the Denver Gazette, Judiciary Chairman Rep. Jim Jordan, R-Ohio, sent letters to Denver and Boulder district attorneys, county sheriffs, and police chiefs. The letters, co-signed by Rep. Tom McClintock and Colorado Rep. Gabe Evans, accuse local officials of prioritizing "illegal and criminal aliens over American citizens" and set a June 3 deadline for turning over materials for the committee's oversight work.
What the committee requested
The committee's letters seek a broad range of documents, stretching back more than a year. They ask for communications with ICE dating to Jan. 1, 2025, prosecution records involving noncitizens since that date, counts of ICE detainers the agencies declined to honor, and any employee training materials that explain how local staff should handle interactions with ICE, according to the Denver Gazette.
The letters also request communications between district attorneys' offices and law enforcement agencies about immigration enforcement. In sharply worded language, they argue that "under your office’s pro-crime, pro-illegal immigration policies, illegal alien criminals are allowed to freely operate, terrorize local communities, and reoffend without consequences," as reported by the Denver Gazette.
Local policy backdrop
Boulder has already been under the microscope over how it shares surveillance data. The city provided automatic license plate reader data to ICE for roughly three years before reining in that access last summer, according to the Boulder Reporting Lab. That decision helped fuel local backlash and set the stage for the current scrutiny.
In Denver, the tug-of-war over federal access to local information took a sharper turn in February, when Mayor Mike Johnston signed an executive order that bars ICE from accessing city databases or technology unless agents come with a subpoena, warrant or court order, according to CBS Colorado. Both cities are also operating under a statewide framework: Colorado law HB19-1124 prohibits local authorities from holding people solely based on ICE detainers, as outlined in the Colorado legislature.
Legal backdrop and what's at stake
The current probe arrives on the heels of a high-profile legal battle. In 2025, the U.S. Department of Justice sued the City of Denver and the State of Colorado over their immigration-related policies, arguing that local limits on cooperation with federal authorities went too far. A federal judge dismissed that lawsuit in March, a ruling that local leaders have pointed to as they defend their approach to cooperation limits, Colorado Politics reported.
This latest inquiry is part of a broader congressional focus on so-called sanctuary jurisdictions, which has featured an escalating series of document demands and hearings, a memorandum from the House Oversight Committee shows.
What happens next
Once Denver and Boulder respond, the Judiciary Committee will comb through the material and decide whether to turn up the heat. Lawmakers could issue subpoenas or haul local officials before public hearings if they conclude that the initial production is incomplete or raises new questions.
For their part, city and county officials have legal options ranging from full cooperation to challenging portions of the requests. How they thread that needle ahead of the early June deadline will determine whether this stays a paperwork fight or spills into a much more public showdown.
