Sixteen 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 suit announced Monday 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.

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

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