Kavanaugh Urges Trump to Consider Martial Law for Immigration Enforcement In Supreme Court Decision

When President Trump moved to deploy the National Guard in Illinois to assist ICE with immigration enforcement, the legal question that followed sounded deceptively technical. It turned on just two words in a federal statute: “regular forces.” But buried in that phrase is a constitutional fault line that runs straight through the boundary between civilian law enforcement and military power.

The statute allows the President to federalize the National Guard only if he is “unable with the regular forces to execute the laws of the United States.” Trump’s administration argued that “regular forces” meant civilian law enforcement — ICE agents, federal officers, local police — and that those forces were being obstructed or overwhelmed. Illinois argued the opposite: that “regular forces” refers to the U.S. military, not civilian policing.

The Supreme Court agreed with Illinois. It held that “regular forces” means the regular armed forces of the United States. In practical terms, that means before a president can deploy the National Guard under this statute, he must first determine that even the military is unable to enforce the law.

That holding alone is striking. It reframes the National Guard not as a backstop for law enforcement, but as something that comes after the military option. And yet, the most consequential part of the decision isn’t in the majority opinion at all. It’s in Justice Kavanaugh’s concurrence.

Kavanaugh’s “Narrow” Concurrence — and the Signal It Sends

Justice Kavanaugh agreed that Trump lost this round. But he was careful to explain why: not because the president lacks authority in general, but because Trump failed to make the required determination that he was unable to enforce the law with the U.S. military.

Then comes the sentence that matters most. Kavanaugh notes that the president would have “great discretion” in making that determination.

That single parenthetical does enormous work. It’s a signal — not to the public, but to future presidents and their lawyers. The problem here wasn’t that Trump reached too far. It was that he skipped a step.

Kavanaugh is effectively saying: You didn’t do it the right way — but you could.

The Roadmap Hiding in Plain Sight

Read plainly, the concurrence sketches a roadmap for how a president could try again:

First, formally consider using the military to enforce federal law.
Second, determine — using broadly defined, highly discretionary criteria — that the military is “unable” to do so.
Third, only then deploy the National Guard.

What counts as “unable”? The statute doesn’t say. It could be cost. Readiness. Optics. Competing priorities. A belief that the military has better uses elsewhere. These are not factual findings courts can easily test. They are political judgments — and courts traditionally defer to them.

That’s what “great discretion” really means.

Skirting the Edge of Martial Law

Here’s the part that should make people uncomfortable: once a president is expected to seriously consider using the military to enforce domestic law, we are already brushing up against the logic of martial law — even if the term is never spoken.

The act of considering the military is not neutral. It normalizes the idea that armed forces are a legitimate domestic enforcement option. And once that premise is accepted, the barrier between civilian governance and military power becomes thinner than many people realize.

Kavanaugh frames his opinion as cautious and narrow. But in reality, it invites a future president to do exactly what Trump attempted — just with cleaner legal formalities.

Why This Matters

Trump lost the case, but the executive branch gained something arguably more valuable: instruction. The Court didn’t slam the door. It explained how to open it next time.

And when the law grants broad discretion, and courts signal reluctance to intervene, history suggests a predictable outcome. Judicial review arrives late — if it arrives at all.

This case isn’t just about immigration enforcement or a standoff with Illinois. It’s about how easily procedural steps can become a pathway toward something far more dangerous — and how casually that pathway can be acknowledged in a judicial opinion.

That’s what makes Kavanaugh’s concurrence unsettling. Not because it declares martial law, but because it quietly explains how close a determined president could come without ever using the phrase.

IF YOU NEED A LAWYER CONTACT US