Where in the Constitution does the Federal Government get the power to pass immigration laws? If they are to be passed, it is a power reserved to the States.
I don't support immigration laws even if they were constitutional. I also believe that property rights should be protected. Nobody, immigrant or native, should be allowed to trespass. Without welfare (medical, education, and cash assistance), the immigration problem would disappear. The people who come here will be the people you would be happy to have as neighbors. If you can get politicians to enforce border laws, you can get them to enforce laws that prevent immigrants from getting on the dole
A person stepping across the border does not violate national sovereignty. Only a transnational government or a world government can do that. Borders only have political importance. They don't have economic importance.