Immigration was a big issue at the last Republican so-called debate.
It is really an issue of selfishness. Those already in the U.S. under mundane laws saying it was all right to takeover all American-Indian land, which is what happened, now say that no one else may enter without adhering to very strict rules. Regardless, now that the U.S. economy is turning bad if it continues, many will change their minds about wanting to come to the U.S.
The whole mindset is wrong though. The right mindset is real Christianity as preached by Jesus and not as preached by the twisters who have come afterwards and who still twist today.