New Mexico Sens. Tom Udall Thomas (Tom) Stewart UdallLWCF modernization: Restoring the promise OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency MORE (D) and Martin Heinrich Martin Trevor HeinrichSenate Democrats demand White House fire controversial head of public lands agency Senate Democrats seek removal of controversial public lands head after nomination withdrawal Five takeaways from final Senate Intel Russia report MORE (D) are calling for an investigation following reports that a right-wing militia group has begun stopping migrant families along the southern border.

“Reports of a militia group illegally operating in New Mexico and intimidating asylum seekers must be immediately investigated by the proper authorities. Vigilante groups attempting to utilize authorities reserved for law enforcement cannot be tolerated," Udall and Heinrich said in a joint statement Friday.

They added that they will "closely monitor this situation and work with local and federal authorities to ensure a full investigation, and that public safety and the rule of law is upheld.”

ADVERTISEMENT

The New York Times reported Friday that the group, which calls itself United Constitutional Patriots, has recently filmed their detention of migrants and uploaded the footage on social media, including stopping approximately 200 migrants who crossed the border this week near Sunland Park, N.M., and who intended to seek asylum.

The American Civil Liberties Union (ACLU) sent a letter asking New Mexico Gov. Michelle Lujan Grisham Michelle Lynn Lujan GrishamBiden pick creates furor, underscoring bitterness over Obama immigration policy Buttigieg, former officials added to Biden's transition team No documents? Hoping for legalization? Be wary of Joe Biden MORE (D) to address the situation.

Lujan Grisham said it is "completely unacceptable” that migrant families “might be menaced or threatened in any way, shape or form when they arrive at our border.”

“It should go without saying that regular citizens have no authority to arrest or detain anyone,” she said in a statement.

A spokesperson for the governor told CNN that they are working with the attorney general's office, "state police and local police to determine what has gone on and what can and will be done."

Jim Benvie, a spokesman for the United Constitutional Patriots, told the Times that their actions were legal and similar to a "verbal citizen's arrest."

“We can't make them stay if they don't want to,” he said.

Benvie added to the Times that members of the group are told not to point their weapons at the migrants, adding that they have a new rule that members of the militia group cannot carry a military-style rifle, but they can still carry a handgun while on patrol.