Open borders to basically any and all immigrants, a point we seem to be halfway to already, would for generations depress wages, already stagnant, for low- and medium-skilled workers in the United States. Trump’s opposition to open borders and calls for tighter controls on immigration explains his strong support among blue collar workers, traditionally Democrats, even among blacks and Hispanics who understand the deleterious impact more immigration will have on their jobs and wages. The Democrats want open borders to gain more Democrat voters, and they figure the workers who support them blindly will stay blind. The Republican party elites, funded by business interests, want open borders to access a bottomless cup of cheap labor. The American workers get screwed and they’re rightfully “angry” about that. Those “Reagan Democrats” who now see clearly what's going on want to return to the Republican party, but Paul Ryan and the elites of Republican party don’t want them. They’d rather have Hillary Clinton, corrupt to the bone, with open borders and cheap labor. Republican elites would be happy to “pay to play” with Hillary – they think they can make a lot of money with her and her crowd; with Donald Trump and the “angry voices” of his supporters, not so much.