The now-ubiquitous phrase undocumented citizens as used so often by various media and other Leftists, is nonsensical! The very word citizens implies that these individuals have entered into the United States Compact (Constitution) when they have not.
Related reading: The Civic Cost Of Illegal Immigration by Victor Davis Hansen. Excerpt:
...[L]ost in this conundrum are the pernicious effects of illegal immigration on the idea of citizenship in a consensual society. In the Western constitutional tradition, citizenship was based upon shared assumptions that were often codified in foundational constitutional documents.Read the rest HERE. Worth your time.
When borders are fluid and unenforced, it inevitably follows that assimilation and integration also become lax, as society loses a sense of who, or even where, their residents are. And the idea that the Bill of Rights should apply to those beyond U.S. borders may be a noble sentiment, but the practical effect of such utopianism is to open a Pandora's box of impossible enforcement, affronts to foreign governments, endless litigation, and a diversion of resources away from protecting the rights of citizens at home.
Residency is also confused with citizenship, but they are no more the same than are guests at a dinner party and the party's hosts, who own the home.
A country reverts to tribalism unless immigrants enter it legally-often based on the host's determination of how easily and rapidly they can become citizens, and the degree to which they can benefit their adopted country-and embrace its customs, language, and habits.