A judge has issued an emergency restraining order that prohibits the Trump administration from making civil immigration arrests at the San Diego federal courthouse, saying the widespread practice “invades the decorum and dignity of the court” and violates common-law principles dating back to the 15th century.

“The court is not an ‘arrest pad’ nor will it ever be,” U.S. District Judge Dana Sabraw said in a strongly worded opinion filed late Monday.

At issue in the case are two wholly separate legal systems.