Oh boy, let's spend more money - politician's answer to everything. Why not just build a fence and back it up with technology and patrols?
To everyone against a border fence I ask; why not try it? It's a releatively small investment, and if it doesn't work it can be removed.
Like they are using drones and virtual fences in Washington.
Ever been to Washington? I went to Reagans Funeral.
That city is nothing but one big fortress!