Federal District Judge Randolph Moss stated that the president cannot establish an alternative immigration system that bypasses existing congressional statutes.
The ruling prevents the president from denying individuals the opportunity to apply for asylum and will take effect on July 16, allowing the administration two weeks to appeal.
The American Civil Liberties Union and other immigrant advocacy groups successfully challenged the order, calling the decision “hugely important”.
The Trump administration, which has repeatedly attacked court rulings undermining its policies, is expected to appeal, despite recent significant drops in illegal border crossings.