I do think we need a wall and for the Army to make border parol a regular part of their rotation
1. To keep illegal immigrants out, and
2. To keep the Mexican Army out.
Four Mexican army soldiers entered southern Arizona and pointed their rifles at a U.S. Border Patrol agent early this week, the Border Patrol said.
The incident Sunday was the Mexican military's 43rd incursion across the U.S. border since October, the agency said. However, it was unusual because firearms were involved. The Border Patrol and the Mexican government are investigating, Border Patrol spokesman Mike Scioli said. (Emphasis mine)
Minefields might help too, methinks...