…the home countries of the illegal immigrants don’t have to take them back. There are 13 countries that generally refuse to take back their immigrants:
- Bhutan
- Burundi
- Cambodia
- China
- Cuba
- Eritrea
- Hong Kong
- India
- Iran
- Iraq
- Laos
- Pakistan
- Russia
Apparently China is the worst offender.
Growing Numbers of Chinese Migrants Are Crossing the Southern Border
Americans have given various degrees of sanctions to those 13 countries, with some success.
https://www.migrationpolicy.org/article/recalcitrant-uncooperative-countries-refuse-deportation#:~:text=The%20United%20States%20has%20long,Laos%2C%20Pakistan%2C%20and%20Russia.