It is a bit from the 2016 campaign trail, it basically uses the analogy that immigrants are snakes, and if we take them in, we cannot be "upset" or "angry", when they, as they eventually will, "bite" us, in the form of terrorist attacks, killings, drugs, rabies, whatever insanity they have dreamed up.
It really is truly fascist in nature, and not hyperbolic. The right is deeply racist, and this is what they really believe. People kill me talking about "both sides", or "i don't like either party", it isn't left and right, it is good and evil, honestly to me, the very "soul" or whatever there was of the country is at stake.