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President Donald Trump on Tuesday raised concerns about the sale of plastic guns made with 3-D printers, a day after several USA states sued his administration to block online publication of designs to make weapons that security screening may not detect.

U.S. District Court Judge Robert Lasnik granted a temporary restraining order on Tuesday night barring a trove of downloadable information about creating the do-it-yourself weapons.

"There is a possibility of irreparable harm because of the way these guns can be made", Judge Lasnik said ahead of the plans' scheduled nationwide release on Wednesday.

In June, the company had reached a settlement with the USA government that allowed it to resume posting downloadable blueprints for 3D-printed guns.

The second measure is meant to ensure that even guns primarily made of plastic can be discovered by metal detectors.

The lawsuit against the Trump administration was filed in Seattle, Washington, by the state's Attorney General Bob Ferguson.

A Texas company has the blueprints and was ready to download them free of charge. The decision blocked a settlement President Donald Trump's administration had reached with a Texas-based company, which initially said it planned to put files online on Wednesday.

Another gun advocate copied the new coding website and shared the open-source plans on his WordPress page.

At a news conference on Tuesday, Connecticut Senator Richard Blumenthal said that if President Trump did not block sale, blood was "going to be on his hands". "Already spoke to the NRA, doesn't seem to make sense".

These basic guns can be made by anyone who owns a 3D printer, which uses plastic or other materials to build up an object layer by layer. "The age of the downloadable gun formally begins", the website states.

3D printed guns generally fall apart after a couple of shots.

Lasnik said First Amendment issues had to be looked at closely and set another hearing in the case for August 10.

By providing the instructions, the company would be helping Pennsylvanians circumvent state laws requiring gun-buyers to be at least 18 years old, pass background checks and obtain licenses and permits for some weapons, Shapiro's office has said.

If bans on so-called assault weapons, high-capacity ammunition magazines and bump stock accessories won't stop criminals from getting such weaponry, as the NRA frequently says, why should we believe that the Undetectable Firearms Act is a sufficient safeguard against the proliferation of firearms that can skirt security measures? "Right now, we need an injunction, and we need it today".

On Monday, 21 state attorneys general signed a letter to Secretary of State Mike Pompeo and Attorney General Jeff Sessions, urging them to withdraw from the settlement agreement.