The Military Is Now Detaining Migrants. Here's What That Means.

The Justice Department just gave the U.S. military a new power: the ability to arrest people for trespassing in military zones near the southern border, without a warrant, and transfer them directly to law enforcement. On its face, it sounds like border security. But it raises a question that's haunted American law for 150 years: Should the military be a police force on American soil?

Here's what happened. The Trump administration designated six "National Defense Areas" along the southern border in Arizona, California, New Mexico, and Texas. These aren't military bases in the traditional sense, they're wide strips of land, some of it civilian property, cordoned off and declared off-limits. In April 2025, the Justice Department began prosecuting people apprehended in these zones for trespassing. On Friday, the Office of Legal Counsel issued an opinion saying the military can arrest people who leave these zones before federal agents can pick them up for trespassing.

This matters because it chips away at the Posse Comitatus Act, a rule passed after the Civil War that prohibits the military from enforcing domestic laws. The rule exists for a reason: democracies don't use their armies as police. But the administration's interpretation exploits a loophole: the military can act to "protect" military installations, and if you expand what counts as a military installation, you expand what the military can do.

What the Numbers Actually Show

The article says the military task force has made 161 temporary detentions in these zones so far. That's a small number. The article also reports that fewer than 240,000 migrant apprehensions occurred along the southern border in fiscal year 2025, down sharply from 1.5 to 2 million in previous years. The administration attributes this drop to its crackdown, including closing the asylum system.

Those numbers are real. But they don't tell the whole story. A dramatic drop in crossings can happen for many reasons: seasonal patterns, word-of-mouth deterrence, economic conditions in origin countries, or a combination. The article doesn't claim the military detentions caused the drop, that would be a stretch, given that only 161 detentions have occurred. It's also worth noting that the military deployment itself is large: more than 20,000 service members have served on the border, with 8,000 currently assigned.

Where CGP Stands

The Common Good Party supports a secure border. We also support honest immigration policy that matches what America actually needs. But we don't support using the military as a domestic law enforcement agency. The Posse Comitatus Act exists to protect citizens from military occupation of their own country. That protection matters.

There's a second issue here: accountability. The article notes that the OLC opinion is "advisory only and does not set any legal precedent." That's true. But advisory opinions from the Justice Department influence how agencies behave. And once the military starts detaining people near the border, it becomes normal. The next administration might expand it further. The rule erodes one step at a time.

We also need to be honest about cost. The article mentions that more than 20,000 service members have been deployed to the border since Trump took office. That's 20,000 soldiers not available for other missions, at significant expense. The Common Good Party believes in fiscal honesty. If we're going to spend this much on border security, we need to know whether it works, and whether there are cheaper ways to achieve the same goal.

Read the full CBS News report.