"Deporting to Mexico is much easier. You just put them on a BP bus back to Mexico."
Turning the border zone into civilian free fire marksmanship training area (Border Patrol participation welcome) would be both cheaper and much more efficient. Within 3 weeks the problem would solve itself.
An idea worth further examination.
We can't build a wall. Even if we increased the numbers across the border it still wouldn't be enough to cover every perimeter.
We could also rotate more of our military to the border for training exercises. They'd serve as deterrant without it being in official capacity.