I agree with what you're saying and I don't think what I say next matters as much because the outcomes seem similar. But I think it needs to be pointed out.

Maybe it is just posturing and lies, but the conservative viewpoint has been to have a merit-based system for permitting immigrants into the country, as opposed to immigration based on familial relations. Every country gets to decide what kind of people that they want coming into their country and I think its perfectly fine for conservatives to feel that way (it is a different matter that I don't agree with that idea). My perception (again, which might be wrong) is that that is essentially what Republicans have been getting at for the past couple of decades (perhaps more).

Now, that being said: these are the same folks who were about Family Values, Fiscal Purity etc. So, like I said before, I don't think the arguments are being made in good faith. But the argument does have merit.