Nigel Farage is three large gin and tonics in, and there is as yet no sign that dinner is imminent. And he has just announced that he has a midnight hit on Fox News.“It makes no difference. I have the five-pint rule,” he says, glass in hand. “Up to five for live telly.” Then he explodes into the sort of throaty guffaws that mark out a man who expects a decent bottle of claret with dinner, and a cigarette on the sidewalk between courses.Britain’s most famous Brexiteer is in a good mood as surveys the comings and goings in the chandeliered lobby of the Trump Hotel. As well he might. His political star is on the rise once again. He met President Trump earlier in the day, his new Brexit Party could help decide the...