Because most illegals are Mexican and most Mexicans are illegals.
“Because most illegals are Mexican and most Mexicans are illegals.”
In the US most Mexicans are native born citizens. Often going back several generations.
When I grew up in Orange County in the 50s and 60s, about 1/4 of my classmates were “Mexicans,” and they are now grandparents of citizen children.
GW Bush earned 40% of the Hispanic vote in 2004, but Trump is insulting citizen Hispanics.