To be honest with you, I think that entire article is complete BS because of the way that the term 'immigration' has been nearly redefined in our modern culture. It's not insignificant that the word 'illegal' has been left out of the equation. People do not have a problem with legal immigration, but many people - such as myself - have a big problem with people being allowed to stay after entering the country illegally, while others are spending the time and a hell of a lot of money to go about immigrating the legal way. That article, like damn near all the others offered on the issue, are not focusing on the real problem with immigration, and nobody out there is trying to do anything about simplifying the process for immigrants to come here legally and integrate into our society.
There's a lot more than just a resonance among uneducated white republicans in the reaction to Trump's stance on the issue. Articles like that one only serve to buttress the continuing false narrative regarding immigration.