Trump is not inarticulate, though people often say that. Rather, he is hyperarticulate in the mode that used to be called “garrulous.” Words constantly emerge from his mouth, and he clearly likes saying them and believes that his eloquence flows; but his words flow in the way that debris floats down a swollen stream, quickly or slowly spinning, drifting, knocking into one another, getting caught on overhanging branches, submerging and then popping again into view.

Trump is not inarticulate, he is asyntactic. “Syntax” means to arrange together, and Trump’s utterances have no discernible arrangement, and possess no unity. Consider the passage — but of course you could choose almost anything he says — this passage:

One of the problems that a lot of people like myself — we have very high levels of intelligence, but we’re not necessarily such believers. You look at our air and our water, and it’s right now at a record clean. But when you look at China and you look at parts of Asia and when you look at South America, and when you look at many other places in this world, including Russia, including — just many other places — the air is incredibly dirty … if you go back and if you look at articles, they talked about global freezing, they talked about at some point the planets could have freeze to death, then it’s going to die of heat exhaustion. There is movement in the atmosphere. There’s no question. As to whether or not it’s man-made and whether or not the effects that you’re talking about are there, I don’t see it.