"For years, and as recently as April 2018, the federal government recognized that these printable-gun computer files would be a threat to United States national security and foreign policy interests", said Attorney General Grewal.
Meanwhile, Defense Distributed agreed to block temporarily Pennsylvania residents from downloading the plans after state officials went to federal court in Philadelphia on Sunday (Monday NZT) seeking an emergency order.
White House spokesman Hogan Gidley expanded on the president's comments Tuesday night, telling reporters: "It is now illegal to own or make a wholly plastic gun of any kind - including those made on a 3D printer".
On issue after issue, the Trump administration's M.O. when there's a crisis is to say, 'We'll look into it.
He successfully argued that the US Constitution's Second Amendment, which guarantees the right to private gun ownership, should extend to a person's right to make guns at home - uncontrolled by authorities, since they will bear no serial number.
In 2013 Defense Distributed posted downloadable files of 3-D printer designs of a one-shot pistol called the Liberator to its website, Defcad.com.
Media captionCody Wilson invented the first 3D printed gun.
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Gun experts say plastic guns may not work without some metal parts and that they could blow up in the hands of users.
Gutowski added that the majority of guns produced with the aid of 3D printers are detectable with metal detectors as other firearms are.
Trump's comments come as eight states and the District of Columbia are taking legal action against his administration for permitting the release of the gun-printing plans. The Trump administration reversed course, agreeing to allow Defense Distributed to publish the tutorials online. Already spoke to NRA, doesn't seem to make much sense!' the president tweeted.
Defense Distributed founder Cody Wilson said the site has disabled downloads until he reviews the order. "Federal law passed in 1988, crafted with the NRA's support, makes it unlawful to manufacture, import, sell, ship, deliver, possess, transfer, or receive an undetectable firearm".
The 3D-printed guns files are slated to be uploaded on DEFCAD.com this Wednesday.
But in the past three days, more than 2,500 people have downloaded Wilson's blueprints for 3D-printed AR-15 style assault rifles.
The decision blocked a settlement that Trump's administration had reached with a Texas-based company, which initially said it planned to put files online Wednesday.
White House spokesman Hogan Gidley later told reporters it's illegal "to own or make a wholly plastic gun of any kind, including those made on a 3-D printer".