Can't, construction is too interconnected. If a company turns in a competitor for using illegals, then he will be black-balled by the G.C.s also using illegals. And since the federal government's position is that illegals are to be rewarded, he can also look forward to being investigated by the IRS, OSHA, the EPA, and various other alphabets until his racist ass folds.
That is our point, that illegals are depressing wages for everyone in fields that illegals can do. Why would you consider wages acceptable to a dirt poor Guatemalan farmer to be the proper level? I would say that the pay agreeable to an American employer and an American employee is the proper level for an American job.