"It's inexplicable that the administration is allowing this to go into effect at midnight tonight".
"You can make it illegal to possess 'em and that'll discourage a lot of people", Kelly said. Cuomo issued a cease-and-desist letter to Defense Distributed to block the distribution of designs for 3D guns in NY.
Downloads of data to produce untraceable plastic gun parts on a 3D printer have been halted by a federal judge in Seattle this afternoon.
One website, CodeIsFreeSpeech.com, posted eight sets of files and reported more than 100,000 hits and almost 1.5 terabytes of data downloaded by 6 a.m. Wednesday.
The technology could herald an era of DIY guns that can be produced - and amassed - in secret.
Democrats agreed and said Trump had the power to stop it.
And Senator John Cornyn of Texas, the second-ranking Republican, said, "People shouldn't be under the impression they can download this and make an undetectable firearm".
"A gun that can evade the detection system, it just defies common sense, and yet this is what the Trump administration has done", said Nelson. "The President is committed to the safety and security of all Americans and considers this his highest responsibility".
"What the blue states got here is a court order that will force us to take down files off the internet, says Blackman".
In 2013, the Bureau of Alcohol, Tobacco, Firearms and Explosives made public tests it has done on the Liberator model.
The Trump administration previously ruled to allow Wilson and Defense Distributed to publish the blueprints.
An attorney for Defense Distributors told The Associated Press he doesn't know how many blueprints have been downloaded in the intervening days, but some news outlets say the online manuals have been downloaded thousands of times and posted elsewhere online. His lawyer did not immediately respond to a request for comment on Tuesday night's ruling.
The decision was made after eight Democratic attorneys general filed a lawsuit earlier in the week seeking to block the settlement.
State Department officials said their only role was to prohibit export of the blueprints outside the U.S.
The company's founder, Cody Wilson, describes himself as a crypto-anarchist and a gun rights activist.
Christian Miller, who works at Northwest Arsenal, a Eugene gun store and shooting range, said he supports 3D-printed guns.
The State Department reversed course in late June, agreeing to allow Wilson to resume posting the blueprints.
The U.S. State Department sent a cease-and-desist letter and accused Wilson of potentially breaching International Traffic in Arms Regulations. Defense Distributed fought back in court, arguing among other things that it was violation of free-speech rights.