Trump's DOJ Sues Four Democratic-Led States Over Undercover License Plates for Federal Agents

Here's a story that sounds like it's about car tags — but it's really about how far states can go to resist federal immigration enforcement.

The Trump administration is suing four states over their refusal to issue undercover license plates to federal agents, the latest front in the wider struggle between the White House and Democratic-led states over the Republican president's immigration crackdown. The four states in the crosshairs: Maine, Massachusetts, Oregon, and Washington.

So what's an undercover license plate? It's basically a regular-looking plate that isn't registered to a specific law enforcement agency — meaning civilians (or, say, criminal networks) can't look up a plate and immediately identify the car as a federal vehicle. They're a standard tool for undercover work and surveillance operations.

The lawsuits stem from decisions by state motor vehicle departments to suspend or heavily restrict the issuance of confidential, undercover license plates to Department of Homeland Security personnel, including Immigration and Customs Enforcement (ICE) and Customs and Border Protection. Critically, state and local law enforcement agencies have continued to receive undercover and confidential plates during the review — meaning federal agencies are being treated differently than their state counterparts. That's the crux of the DOJ's argument.

The federal government is leaning on a constitutional principle called the Supremacy Clause — the idea that federal law takes precedence over state law. Prosecutors are requesting that each state's policy be declared unconstitutional and invalid under the intergovernmental immunity doctrine within the Supremacy Clause, and that the program be resumed for federal agents, as it has continued for state and local agencies.

The administration asserts that federal agents "frequently investigate and apprehend violent criminals, including cartel members, gang members, sex offenders, human traffickers, and other violent offenders" and says making those authorities easily identifiable subjects them to increased harassment and potential physical harm.

The states aren't backing down. Maine's Attorney General argued that the program "reflects a legitimate and constitutional policy choice" not to allow state resources to be "commandeered by the federal government for use in civil immigration enforcement activities that have, in Maine and elsewhere, resulted in multiple incidents of abusive and unconstitutional conduct by DHS officials."

Maine's Secretary of State Shenna Bellows announced a pause on confidential license plates back in January, after federal authorities ramped up immigration enforcement in the state. Notably, Bellows is also a Democratic candidate for governor.

This wasn't a surprise lawsuit — there was a warning shot first. The DOJ says the lawsuits came after Maine, Massachusetts, Oregon, and Washington each "refused to rescind" the policies following a letter sent on May 12 warning of their alleged illegality.

But the stakes here go well beyond license plates. While the lawsuit focuses on undercover license plates, constitutional law experts say the case could have broader implications for Oregon's sanctuary law and the state's relationship with federal immigration authorities. Norman Williams, a constitutional law professor at Willamette University College of Law, said the central legal question is not just whether Oregon must issue confidential plates to federal agencies, but how much assistance states are required to provide federal law enforcement. "If the federal government wins, it's going to be very difficult for Oregon to enforce its sanctuary law," Williams said.

In other words, if the courts side with the DOJ, it could set a precedent that states can't withhold any state-administered service from federal immigration enforcement agencies — even if that state has a law designed to limit exactly that kind of cooperation. That's a potentially huge shift in how much ground states have to resist federal policy.