Steve King, has proposed an electric fence to be built along the US - Mexican border. He probably remembers the old weed burner fencing. These gave an unpleasant bite, but were implicated in a number of fires.
It would be cheaper than the Berlin Wall types being considered. I don't think the Mexicans will figure out how to defeat electric fencing with insulated wire cutters. The livestock never did.
Iowa always sends the creepiest Republicans to Washington. Remember Wiley Mayne? He was still saying that the Watergate case was only, "a series of inferences piled upon other inferences", while Dick was packing his suitcase.