fifeboy fifeboy:
Responding to an invasion and supervising a border don't appear to me to be closely related.
As has been pointed out, the army has experience with patrolling borders.
Besides, the cartels have better weapons than the Mexican army.
Simply put the wall 500 yards inside the border, and anything in front
of it becomes a kill zone. End of discussion.
The Warsaw Pact was pretty good as stopping people from going over;
The IDF also has experience with Hamas tunnels.
So, everyone has experience to help Trump. All he has to do is get serious about it.