What free market proponents are in favor of free trade but against free immigration? In my experience part of the libertarian ethos is about opening up immigrat

What free market proponents are in favor of free trade but against free immigration? In my experience part of the libertarian ethos is about opening up immigration. The only way I can imagine a free-market proponent who is in favor of free trade holding consistent beliefs which are also against immigration is if they are for immigration from a trade perspective, but against it on some other grounds such as national defense or national identity. You can imagine that the justification for at least the national defense reasoning is that if you let in a lot of people, you'll end up allowing some sort of fifth column or something to develop in the heart of the nation. Frankly, I don't buy any of the objections I've seen to basically unlimited immigration, but there are at least some that are intellectually consistent with a free-market position. You can find a laundry list of anti-immigration positions (many of which are at least intellectually consistent with a free market philosophy), alongside their specific refutations over at http://openborders.info http://openborders.info