I agree, however, it won't cost but a mere fraction what Congress spends each fiscal year on pork.
Have not done the calculations for I have not a good feel for labor rates in each affected state, nor the cost of re-inforced concrete, electronic survalance systems, lighting, utility power distribution, secondary walls to prevent most from getting at main wall, etc.. But from the waters of the gulf westward to the pacific is going to be one hell of a system. And it must be high enough, tough enough, under layed concrete deep enough not to burrow under, etc.. Easily twenty or more billion at todays costs. I'm not suggesting not to do it. I'm for it. But it has to be budgeted like anything else. And I bet it would take quite a few years to complete. Better late then never. Just a bit skeptical that anyone is serious enough to do the job right. The wall as to be tough enough to last many years, and high and wide enough to keep anyone from getting through, over, under. I bet it would require more concrete then all the damns built in the USA.