It won't be built directly on the border.  It will be built slightly inside the US territory.  So I doubt illegals will be hired. In fact, they will sub-contract it out to a Haliburton subsidiary and we will pay $50 / hour plus $100 per diem for guys to stand around and watch the one illegall *they* hired to build the wall.\n\nAnd currenly, the border is the Rio Grande River.  Mexico diverted it a bit.  A park the US had built on the river's edge became Mexican property because the new route for the river put the park on the southern side of the river.