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Humans, being mobile organisms, have a natural right to perambulate on their own two feet and to migrate. Which is why I would argue, regardless of how common it is, that the effort to restrict immigration is a violation of human rights and contrary to the U.S. Constitution.  On one level, it violates the equal protection clause since it seeks to prevent the entry of persons who might stay longer and labor to sustain themselves while welcoming people who arrive with lots of money in their pockets.  On another level, declaring migration illegal seeks to criminalize the perfectly good or non-injurious behavior of persons who aren’t even within the jurisdiction of the United States.  In other words, the U.S. is trying to criminalize behavior, which people in other countries might be inclined to engage in.  Talk about being presumptuous.
Preemptive law is no more just than preemptive war.  If humans have a right to wander, then to exclude them from our territory is to deprive them of a right, of which it is only just to deprive them as punishment for a proven crime (injury to someone else).  All this “protective” rigamarole is just an excuse for imposing restraints and segregating some population so the impulse to control and segregate can be satisfied.
Making segregation legal does not change the fact that it’s evil. To segregate humans is to treat them like a subspecies, as less than human.  And that’s evil.