““Inside Trump’s circle, the power of illegal immigration to manipulate popular sentiment was readily apparent, and his advisers brainstormed methods for keeping their attention-addled boss on message. They needed a trick, a mnemonic device. In the summer of 2014, they found one that clicked. “Roger Stone and I came up with the idea of ‘the Wall,’ and we talked to Steve [Bannon] about it,” said Nunberg. “It was to make sure he talked about immigration.””