No thanks.
It's a real and lasting problem that will not go away by rounding them up. slamming the door behind them or throwing them in jail.
To say anything on the contrary, is not only unrealistic, it is patently ignorant.
“Fortress America” is purely a Populist/Libertarian fantasy. It will never become a reality. especially now. If you choose to keep reliving that fantasy, then you never will grasp the gravity of how things truly are. And if you think any political party can win future elections on the criteria you exhibit, then you will find yourself rather isolated and under represented.