Let’s start with “when.” When did it start? We know that the FBI opened its official investigation on 31 July 2016. An obscure, low-level volunteer to the Trump campaign called Carter Page was front and centre then. He’d been the FBI’s radar for a long time. Years before, it was known, the Russians had made some overtures to him but 1) they concluded that he was an “idiot” not worth recruiting and 2) he had actually aided the FBI in prosecuting at least two Russian spies.