As a result, positions often go unfilled, or insufficiently qualified people have to be taken on.

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Wal-Mart Stores ( WMT) has been cutting staff since the recession and pallets of merchandise are piling up in its stockrooms as shelves go unfilled.

FORBES: Walmart Pays Workers Poorly And Sinks While Costco Pays Workers Well And Sails-Proof That You Get What You Pay For

We have an unemployment rate that's very high, but we have millions of jobs in our country today that go unfilled because we don't have a trained workforce.

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"Essentially, we have hard-working Mexicans who are coming to fill jobs that would otherwise go unfilled, but our immigration laws make it impossible for them to do that legally, " said Frank Sherry of the National Immigration Forum.

CNN: Wallace