The talking points are:
businesses: These are low skill, mind numbing manufacturing jobs. They're beneath the dignity of an honest citizen. Americans are too lazy to take them anyway. Job seekers should instead be earning a degree in engineering or medicine for the new wave of high-tech jobs on the horizon.
farms: These too are low skill, mind numbing jobs. If we don't import millions of immigrants there will be food shortages or $5 dollar-a-head cabbage.