"The skills and productivity of American Workers, not to mention the taxes they pay, are the greatest economic resource our country has. To condemn large numbers of them to unemployment, to deprive the Treasury of their tax contributions and to force them to live on unemployment at public expense is the most expensive luxury any society ever chose to buy."

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You are never going to have, in a country as rich as ours [the USA], that borders a country as poor as Mexico, an end to immigration. You just won't. The question is, if you make it humane and if you make it regulated. It's much better for an American worker to compete against a regulated immigrant inside labor standards, than it is to ever to compete against an illegal immigrant.

— Ezra Klein