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.

President Trump's executive order on birthright citizenship is "blatantly unconstitutional," a federal judge said Thursday, temporarily blocking it nationwide, multiple outlets reported. The big picture: The decision came a day after the president offered his first defense of the order,

A federal judge temporarily blocked President Trump’s executive order ending the constitutional guarantee of birthright citizenship.