David Bier writing at Reason.com, making one of my favorite points.
Migration is the exact opposite of an invasion. Nearly all these so-called invaders are coming to serve Americans. This supposed invasion will contribute to the strength and prosperity of the United States, not undermine it. This isn't Santa Anna's soldiers crossing the Rio Grande. It's four kids with their mom reuniting with their dad at a farm outside of Atlanta. They're not coming to blow us up or take our stuff—they're coming to work with us, work for us, and buy our products. They want to be us, not conquer us. And that's the most important point: A crackdown on migration does not vindicate the rights of Americans to be free from foreign attackers. Rather, it is a violation of our rights to associate, contract, and trade with peaceful people born in other countries.
The fact that these actions are so often illegal is lamentable. But Congress could pass a law tomorrow to legalize migration (as it in fact did for the first century of American history). The illegal part of illegal immigration is a problem easily solved by Congress. It does not warrant the suspension of habeas corpus or calling up militias to shoot the "invaders."