See, it's all a big, beautiful ballet.
Poor people have really stupid, tedious jobs that literally anybody could do without any training or education whatsoever. Most working class Americans are aware of this, and that's why illegal immigration terrifies them. So you get xenophobic, racist, anti-immigration propaganda from Newscorp (owned by an Australian immigrant who refused to apply for citizenship until forced to by congress,) which whips the working class into a frenzy with promises that THE REPUBLICAN PARTY WILL FIX IT ALL, even though they ran the country for 20 of the past 30 years and never gave a **** about it.
Then you have rich people, the guys who actually run the republican party and Newscorp, who don't care about the problem. At best it's boring and irrelevant to them, and at worst they recognize how immigration reform is a type of labor market protectionism and oppose it on ideological grounds. Either way, they don't care. They'll vote against it, they'll oppose it in private, because it's not worth their time or effort. They just don't care who's getting paid to scrub their toilets, as long as it gets done. Because the poor aren't important.
This is also why American conservatives oppose healthcare reform, romanticize 'trickle down economics,' oppose financial reform, inflate the wage gap, opposed the civil rights movement, opposed the Reconstruction, and are universally responsible for the most egregious examples of corruption in American politics (e.g. the cabinets of Buchanan, Nixon and Reagan.)