On Wednesday, in a landmark ruling, Mr Ball and his Remain-supporting backers convinced a district judge that the former Mayor of London may have criminally misled the British people during the EU referendum campaign. Unless Britain’s top prosecutor chooses to intervene, Mr Johnson must now appear in… This is the 29-year-old history graduate whose campaign threatens to overshadow Mr Johnson’s Tory leadership push, and perhaps even to derail Brexit itself. “My name is Marcus J. Ball. I am a private prosecutor, and I have a problem with lying politicians.” The well-dressed young man looks directly into the camera and begins to talk. “Hello Boris Johnson,” he says, with the beginnings of a smirk.