My major objections to Harry's "open borders" policy are these:
1) This would allow us no means to identify and catch terrorists and other criminals entering the country to do us harm. Our southern border is already used extensively to import narcotics, and many illegals from countries other than Mexico are first illegally immigrating to Mexico, then wading the Rio Grande into the US.
2) Many illegal immigrants are sending the lion's share of their tax-free income outside the country. We are losing that substantial chunk of production and income.
3) Immigrants legal and illegal are still eligible for a wide assortment of taxpayer funded programs. I'd be willing to pay $5 for a bunch of grapes if I didn't have to pay for their welfare, WIC, medical, dental, insurance, etc, etc. Until the welfare state is disassembled, don't talk to me about an amnesty (or "regularization" or any other euphemism for the same thing) or open borders, thanks. I'm not buying any today.
4) I'm not too worried about our culture, but I'm not crazy about the idea of swearing in millions of new Democrat voters. This isn't really a legitimate objection, just a concern.
Freedom isn't free
Semper Fidelis
Jarhead out.