unfairly targeting a vulnerable population of Mexican immigrants.
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They are Mexicans, not immigrants.
They broke in.
Remove them.
They are immigrants so long as they intend to stay in California. An immigrant is someone moving in to a country or area from another country or region. What his status is is irrelevant. An emigrant is that same person leaving his old home and moving to another country or region. A migrant is that person moving either way permanently or seasonally.