By Jamelle Bouie,
The New York Times
If Donald Trump has a theory of anything, it is a theory of American citizenship. It’s simple. If you are white, then regardless of origin, you have a legitimate claim to American citizenship and everything that comes with it. If you are not, then you don’t.
Trump never quite put this theory in writing. But it guides his behavior all the same. That’s the reason he embraced and promoted the deranged conspiracy theory about...