During a briefing on the category 5 Hurricane Dorian sweeping across the Bahamas and toward the US coast, Donald Trump said: 'All we know is that it's possibly the biggest. I'm not sure I've even heard of a category 5, I knew it existed. And I've seen some category 4s. I don't even think I've heard the term other than I know it it's there and it's the ultimate and that's what we have unfortunately.' Trump has said the same thing – that he has never heard of category 5 hurricanes – at least four times over the last two years, including as recently as May.