Justice Department expands military’s power to detain migrants accused of trespassing
Justice Department Expands Military Power for Migrant Detentions
Wertynews.com – The Justice Department has issued new legal guidance that expands military s power to detain migrants accused of trespassing on defense lands. Released on Friday, the opinion gives armed forces personnel broader authority to hold individuals charged with entering restricted military territories. This move strengthens President Trump's border enforcement strategy.
Under the second Trump administration, the Office of Legal Counsel designated extensive tracts near the U.S.-Mexico boundary as "National Defense Areas." These zones operate outside the Posse Comitatus Act, which normally bars military enforcement of domestic laws. The designation allows soldiers to apprehend trespassers and transfer them to federal prosecutors.
Arrest Authority Beyond Zone Limits
Military personnel stationed in these areas can now arrest people attempting to escape before capture. Deputy Assistant Attorney General William Hyde wrote in his assessment that such actions do not violate the Posse Comitatus Act. He noted the move aligns with a commander's traditional protective power and express statutory authorization.
"In sum, we conclude that the use of military personnel to arrest trespassers just outside of an NDA would not violate the [Posse Comitatus Act], given the express statutory authorization and the military-purpose of a commander's traditional protective power."
Geographic Coverage and Operations
Six national defense areas currently span Arizona, California, New Mexico, and Texas. Officials expect more zones to open based on military recommendations. The Defense Department has placed bilingual English and Spanish signs throughout several locations to warn visitors of restricted access.
U.S. Northern Command published guidance on its website confirming that service members may apprehend trespassers and hand them to law enforcement. Federal prosecutors began filing charges in April 2025. Hundreds of cases followed, with the most common offenses being violations of military security regulations and entering military, naval, or Coast Guard property.
The Pentagon made the border its top priority during the opening days of President Trump's second term. The Defense Department says over 20,000 service members deployed to the region. A spokesperson for the southern border Joint Task Force confirmed the force now numbers 8,000 personnel and has recorded 161 detentions within national defense areas.
Immigration Enforcement Results
The Office of Legal Counsel's guidance remains advisory and does not create binding legal precedent. This military involvement coincides with the administration's near-complete closure of the asylum system for unauthorized entrants.
These combined measures have driven unauthorized crossings down significantly. Border Patrol documented fewer than 240,000 migrant apprehensions along the southern border during fiscal year 2025. That represents a sharp decrease from 1.5 million in fiscal year 2024 and 2 million in fiscal year 2023. The downward trend accelerated in fiscal year 2026, with Border Patrol recording 81,000 apprehensions with two months remaining in the fiscal period.
Frequently Asked Questions
What is the Posse Comitatus Act? The Posse Comitatus Act is a federal law that generally prevents military personnel from enforcing domestic laws. The new Justice Department guidance allows exceptions within designated National Defense Areas.
How many National Defense Areas exist? Six national defense areas currently cover parts of Arizona, California, New Mexico, and Texas. Additional zones may be established based on military recommendations.
What charges can migrants face? Individuals apprehended in these zones can face trespassing charges, violations of military security regulations, and entering military, naval, or Coast Guard property. Most of these offenses are classified as misdemeanors.
How many military personnel are deployed? The Pentagon reports that over 20,000 service members have deployed to the border since the start of the second Trump administration. The southern border Joint Task Force currently comprises 8,000 personnel.