Liberal stupidity run amok.  The purpose of indicating one's sex on a passport is for identification to ensure that the bearer is indeed the person to whom the passport is issued.  With more people roaming the world for nefarious reasons, positive identification is more important than ever.   There are two sexes only for positive identification, male and female.  “X” is non-descriptive.  Preventing people with X passports from entering the country would put an end to this nonsense.   I do not understand why liberals are so quick to adopt and implement every weird concept or idea that comes along.   We probably would have X passports in the U.S. today if Obama was still president.  Thank God Trump will not let it happen.