Donald Trump gave a rambling answer when a migrant farmer who was born in Mexico and now lives in the United States asked him at a town hall Wednesday who would do that job if he followed through with threats of mass deportation. Trump repeated campaign talking points to an audience member at the Univision town hall that African American and Hispanic populations are losing jobs because “tremendous numbers” of illegal immigrants are coming into the country from mental institutions, insane asylums and jails. “The African American population and the Hispanic population in particular are losing jo…