“Our immigration law already treats immigrants differently based on their country of origin.”
Can you name one other law that grants special privileges to a person who is in the country illegally and is from a specific country or geographic region?
Cubans step foot on US soil and get automatic asylum, right?
We have immigration quotas that are different for different countries.
"Visitors" are not immigrants, legal or otherwise. They don't intend to stay or overstay their "non-visa visitor status". They don't get jobs. They don't collect welfare or send their kids to school or get free medical care. They are "visitors". They go back to their country of origin.