Americans cannot work for less than Mexicans because they have a higher standard of living. Yes, the GOP fat cats most definitely want cheap labor that they can pay less for than Americans.
And what can this 'cheap labor" do? Not much, that's why they are cheap. As for the standard of living, that's ridiculous. Americans have a high standard of living because their labor is worth a lot because they are educated and skilled, not because they are Americans. It is frightening how little econ people know.