If the issue was immigration, it was ILLEGAL immigration and its impact on suppressing wages on the low-end as it takes away manual labor jobs while increasing crime and social costs. At least be honest about it and shelve the euphemisms.
As for who objects the most to ILLEGAL immigration, it is almost always immigrants that took the time and effort to enter a country legally. Ask some (I did).
p.s. — Hillary lost because she had a well-earned reputation for corruption and incompetence. Throw in the fact that she was a listless campaigner whose voice sounded grating and you have a recipe for defeat; especially, when there is a world-wide trend against the corrupt Establishment and professional politicians.