Who “deserves” to be here? What criteria are we using?
See: existing immigration laws
What constitutes “under control?” This feels like a 9/11-ish Patriot Act sort of open-ended law.
Only controlled, legal crossings
How does one “shut down” a 2000 mile long border without meaningful defenses?
You don’t. There will be defenses (intrusion detection, border guards, etc.)
What constitutes a fix?
All immigration into the US is in compliance with our current regulations.
How are we tracking migrants, given that plenty of people slip through unnoticed, or cross legally and remain illegally?
It’s almost impossible to live off the map in the US. Will we find every person that illegally snuck into the country? No. But, we will find some of them and either deport or naturalize them.
Questions that beg answers:
See: existing immigration laws
Only controlled, legal crossings
You don’t. There will be defenses (intrusion detection, border guards, etc.)
All immigration into the US is in compliance with our current regulations.
It’s almost impossible to live off the map in the US. Will we find every person that illegally snuck into the country? No. But, we will find some of them and either deport or naturalize them.