Very simple:
The citizens do not share his love of Mexico and Mexicans and do not want their country turned into North Mexico.
My main reason was that he was willing to ignore our border laws just because he had a special feeling for the Mexicans. I have a special feeling for them too, never like to see people so defeated and down trodden. However, we are a nation of laws. We have watched as our laws were ignored, our flag was trampled on and sometimes burned.
Any person running for president should make a promise to uphold the laws of this country. Our Constitution is our law. Uphold it, honor it, abide the laws or GET OUT.
That also applies to Jeb Bush. No excuses.