Does POTUS have the right to ban YOUR travel just because he doesn't like you?  Does POTUS have the right to ban travel of females (or males) simply because they are female/male?  Does POTUS have the right to ban all Democrat party members' travel?  Does POTUS have the right to ban all Catholics' travel?  Does POTUS have the right to ban all non-caucasian travel?  Does Potus have the right to ban caucasian travel?  Does Potus have the right to ban all British subjects' travel (inasmuch as British terrorism perpetrators have been UK citizens).  Only the last one.  But he won't do the last one.  I think he won't do the last one because of a sense (as opposed to any scientific data I have, so DEFINITELY scientific data POTUS does not have) that British subjects traveling to the US are predominantly caucasian - not because he's concerned with provable incidents or terrorism (radical islamic terrorism at that) by British citizens.