Frankly, I think the border wall could use some landscaping. How about a thirty-foot wide hedge right next to the wall with some nice densely-planted thorny bushes and trees like mesquite, cactus, crown-of-thorn plants, etc.? The border could include a thorny hedge with some enormous scorpions and rattlesnakes crawling around the ground as well. After all, we have to be kind to the environment.