He's trying to prop up the working poor by reducing labor supply. I mean it's either that or putting them on welfare. And I don't know about you but I'd rather they were able to take care of themselves. I'll pay a little more at the grocery store.
Is that with or without full-time benefits? And how do you know the "under the table" labor rates illegals get? Labor will be there if price of labor goes up. Price of labor will go up if supply is constrained. Economics 101. This is not a high skill occupation where there can be a genuine shortage of labor. This is way more elastic.