New militarized border zone spurs national security charges against hundreds of immigrants

Several hundred immigrants have been charged with unauthorized access to a newly designated militarized zone along the southern U.S. border in New Mexico and western Texas since the Department of Justice introduced the new approach in late April.

President Donald Trump's administration has transferred oversight of a strip of land along the U.S.-Mexico border to the military while authorizing U.S. troops to temporarily detain immigrants in the country illegally — though there's no record of troops exercising that authority as U.S. Customs and Border Protection conducts arrests. The designated national defense areas are overseen by U.S. Army commands out of Fort Bliss in the El Paso area in Texas and Fort Huachuca in Arizona.

The novel national security charges against immigrants who enter through those militarized zones carry a potential sentence of 18 months in prison on top of a possible six month sentence for illegal entry. The full implications are unclear for migrants who pursue legal status through separate proceedings in federal immigration court.

The Trump administration is seeking to accelerate mass removals of immigrants in the country illegally and third-country deportations, including Venezuelans sent to an El Salvador prison amid accusations of gang affiliation. The administration has deployed thousands of troops to the border, while arrests have plunged to the lowest levels since the mid-1960s.

The federal public defender's office in Las Cruces indicates that roughly 400 cases had been filed in criminal court there as of Tuesday as it seeks dismissal of the misdemeanor and petty misdemeanor charges for violating security regulations and entering restricted military property. Court records show that federal prosecutors in Texas — where a National Defense Area extends about 60 miles (97 kilometers) from El Paso to Fort Hancock — last week began filing the military security charges as well.

Las Cruces-based federal Magistrate Judge Gregory Wormuth is asking for input from federal prosecutors and public defense attorneys on the standard of proof for the trespassing charges “given the unprecedented nature of prosecuting such offenses in this factual context.”

Public defenders say there needs to be proof that immigrants knew of the military restrictions and acted “in defiance of that regulation for some nefarious or bad purpose.”

New Mexico-based U.S. Attorney Ryan Ellison, appointed in April, says hundreds of "restricted area" signs have been posted in Spanish and English to warn that entry is prohibited by the Department of Defense, along New Mexico's nearly 180-mile (290-kilometer) stretch of border.

In a court filings, Ellison has said there's no danger of ensnaring innocent people when it comes to immigrants who avoid ports of entry to cross the border in willful violation of federal law — and now military regulations.

ACLU attorney Rebecca Sheff said basic freedoms are at risk as the government flexes its power at the border and restricts civilian access.

“The extension of military bases ... it's a serious restriction, it's a serious impact on families that live in the border area,” she said.

The Department of Justice has warned Wormuth against issuing an advisory opinion on legal standards for trespassing in the military area.

“The New Mexico National Defense Area is a crucial installation necessary to strengthen the authority of servicemembers to help secure our borders and safeguard the country,” Ellison said in a court briefing.

Democratic U.S. Sen. Martin Heinrich of New Mexico expressed concern Wednesday in a letter to Defense Secretary Pete Hegseth that anyone may be stopped and detained by U.S. Army soldiers for entering a 170-square-mile —440-square-kilometer) area along the border previously overseen by the Department of Interior and frequently used for recreation and livestock ranching.

Hegseth has emphasizing a hard-line approach to enforcement.

“Let me be clear: if you cross into the National Defense Area, you will be charged to the FULLEST extent of the law,” he said in a post on the social platform X.

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Associated Press reporter Valerie Gonzalez in McAllen, Texas, contributed.