Comment by Georgelemental

> Companies want the best candidates they can get, and the larger the recruitment pool, the better.

Yes, at the lowest wages they can get. Increase supply -> lower prices (wages) -> more corporate profits!

However, there are those who believe that corporate profits are not the highest good. Some of us also care about the earnings of American workers.

Also, "best candidates" alone does not "best company" make. You need people who can work well together—which requires some degree of culture fit. Immigration restrictions help preserve the cultural homogeneity that makes collaboration and social trust possible.