Curiously, he said mexico must close the southern border. that will not stop those already in Mexico.
To me that does not compute.
It computes to me.
Shut down the border for as long as it takes Mexico to get its S together and deport the illegals on its territory and prevent entry. About six months in my estimate.
Cost benefit analysis. As a developer Trump has done tons of these. He knows what will make Mexico take action. I see this as an incredibly simplistic cause-and-effect action which is long overdue.