Trump’s grandfather was born in Germany; his mother was born in Britain; his wife was born in Slovenia. Gwenda Blair, author of The Trumps: Three Generations that Built an Empire, said: “The moment he got aligned with the birther thing and saw the reaction, that was it. It had so many dog whistles rolled into one. Not Christian, dark skinned, the capital O ‘other’: he’s been riding on the notion of us and them, winners and losers, a binary version of the world.