Colorado and 15 other states have sued the Trump administration over its plan to allow the sale of forced-reset triggers that make semiautomatic rifles fire more rapidly and return devices already seized to their owners.

The lawsuit filed Monday against the U.S. Department of Justice and the Bureau of Alcohol, Tobacco, Firearms and Explosives argues that returning the triggers would violate federal law, pose a threat to residents and law enforcement and worsen gun violence. It was filed in federal court in Maryland.

“It’s hard enough for our local law enforcement officials to protect Colorado communities from gun violence without the federal government willfully ignoring the law,” Colorado Attorney General Weiser said in a statement. “The law is clear: machine guns, and devices that turn a semiautomatic weapon into a machine gun, are illegal. We’re suing to stop the ATF and the administration from making our communities more dangerous by distributing thousands of devices that turn firearms into weapons of war.”

There had been several legal battles over the devices, which replace the typical trigger on an AR-15-style rifle. The Biden administration had previously argued the triggers qualify as machine guns under federal law because constant finger pressure on the triggers will keep a rifle firing, essentially creating an illegal machine gun.

Rare Breed Triggers, the maker of the devices, had argued that the ATF was wrong in its classification and ignored demands to stop selling the triggers before being sued by the Biden administration.

The Justice Department reached a deal announced last month with Rare Breed Triggers to allow the sale of forced-reset triggers with.