Let's think about immigration. Is there any reason why half the poor people in the world wouldn't want to come to the U.S. and let us support them on welfare?
Right now the only things stopping them are the rigors and expense of the journey, both of which are considerable. Those barriers are not, it turns out, sufficient to stem the horde.
We are prepared to accept some immigrants, but most of us would prefer the US was somewhat choosy about their qualifications and backgrounds (criminal record, etc.). We are not prepared to be overrun by millions who ignore our laws while suckling at the public teat.
Why can't our government stop the flood? Because, at least some politicians and bureaucrats choose not to do so although our laws permit it. Clearly we need to extirpate those scofflaws from government service.
Donald J. Trump may be the instrument by which we accomplish the extirpation.