You may have tried, but you failed.  Exactly what is an immigrant?  Those attacking Carson apparently believe you must enter a country voluntarily to be considered an immigrant.  The word immigrant is a noun which any good dictionary defines as someone who comes to live permanently in a foreign country. Synonyms are newcomer, settler, migrant, emigrant; nonnative, foreigner, alien, outsider; and expatriate.  Nowhere in my research did I find that the migration had to be "voluntary."   Carson is correct in what he said.