All sounds so obvious. I'd be surprised, though, to see even a couple actually implemented. The government is now admitting to more than 22,000,000 illegal aliens in the US, others say it is as many or more than 60,000,000. I suspect the latter. To fix that requires stopping new invaders, if Trump is only one term, then around 30,000 deported EVERY DAY, else, if a second term, then still more than 10,000. When is the last time, if ever, that we've seen a number of deportees even a fraction of that daily count?
I've heard that Hungary has had success with "safe zones" that are outside of the border fence but inside the border. It keeps them out of the country but does not depend on cooperation from the neighboring country who might not want them either. These safe zones don't need to be anything but bare ground.