“Blatantly unconstitutional” is how a federal judge is describing President Trump’s executive order scaling back so-called “birthright citizenship.” The ruling isn’t likely to be the final word, though, in a matter that now will be weighed at the district court level and then, possibly, work its way to the Supreme Court. That would offer a chance to clarify the birthright question, which has been murky since the ratification in 1868 of the 14th Amendment.