Leave nafta? There doesn't seem to be a very thorough analysis on the effect of this.... You can't just make changes to economic policy and hope for the best - there are far and wide impacts to making changes like this.
There are several drastic terms like that, e.g. "Cancel visas to foreign countries that won’t take them back.". When entering negotiations with such a threat you will get what you want, he will be able to easily dictate changes to NAFTA and every country will take their people back. I am not even sure this is such a bad strategy.
