Any nation that can’t hold free and fair elections, with only it’s real citizens eligible to vote, is no longer a legitimate country.
This statement would make 90% of world countries illegitimate. Free and fair elections are still an exception in the world. Most countries are ruled either by tyrannical dictators or crooked strongmen at the best.
Manipulating elections is common exercise in most third world countries.
I would re-phrase it. It will make the country unfree, undemocratic, basically third world banana republic. That’s where are we heading.
It may however solve the immigration problem - when the people of Guatemala will find their country better than the USA and start returning, you know where you are.