Attorney General Jeff Sessions on Thursday warned that the Justice Department will "vigorously enforce" the federal prohibition of producing undetectable 3D-printed firearms "to the fullest extent."

The backdrop: This stern caution comes a day after Sessions' own department asked a federal court to lift an injunction that blocks the public from downloading the blueprints. Almost a dozen states, led by Washington, have sued the State Department for allowing a pro-gun group to publish the files online, arguing it’s a threat to public safety and that terrorists could use undetectable plastic weapons to evade detection.

President Trump had expressed skepticism over 3D-printed guns, which had prompted widespread debate and outrage. “I am looking into 3-D Plastic Guns being sold to the public. Already spoke to NRA, doesn’t seem to make much sense!” Trump tweeted in July.

A new Axios/SurveyMonkey poll this week found that eight out of 10 Americans say they believe 3D-printed gun blueprints should not be available online, a rare consensus on gun policy that cuts across party and ideological lines.