It shouldn't be built at all! It's ignorant and expensive and walls haven't worked for hundreds of years. We just have a moron who doesn't get that tunnels are everywhere along the border and anyone but a handicapped person canclimb his stupidly built walls. We need immigrants to work here. Americans have gotten too lazy for you hysical labor. They will update rather pay to work out!!!! Fools. Live on a farm for a while!