My dad talks about helping Mexicans pick cotton on his grandfathers farm in Central California. One reason my dad tried to do well as he could in school.
I'm less worried about Mexicans spilling over into California than I am about jobs being off shored to the far east. Clinton lost in 2016 because she and Bill Clinton are poster childs for NAFTA and letting China into the world trade organization.
How about prioritizing the most disadvantaged _US citizens_ first instead of kicking the stool from underneath them by importing cheap labor?