Immigrants do not compete with native workers because they have complementary skills (like different native languages). The evidence is very very strong that immigration does not decrease wages. It generally increases them because it provides new demand, though that's not guaranteed.

Demand is limitless and makes no benefit. Only production is beneficial.

That's certainly what Xi Jinping thinks.

Our immigrant ancestors were almost all unskilled. I’d rather the government not tell me where I can or cannot live, as a matter of basic human freedom.