What to know about the ruling blocking Trump's order on birthright citizenship

President Donald Trump’s executive order denying U.S. citizenship to the children of parents living in the country illegally has faced the first of what will be many legal tests. It didn’t fare well. A Justice Department lawyer had barely started making his arguments in a Seattle courtroom Thursday when U.S. District Judge John C. Coughenour began blistering him with questions, calling the executive order “blatantly unconstitutional.” Coughenour went on to temporarily block it pending further arguments. Birthright citizenship is the principle that someone born in a country is a citizen of that country.