RELATED: Everything to know about legal battle over downloadable 3D gun blueprints
State Attorney General Xavier Becerra blames President Donald Trump for a government settlement that would have allowed the plans to be posted online.
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A federal judge has issued a temporary restraining order to block the settlement.
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The guns would be untraceable and undetectable.
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The White House says the administration supports long-standing laws against owning plastic guns.
The Texas company seeking to release the plans, Defense Distributed, says it may appeal.