Geoffrey Nunberg, writing about “the least literate president to take office” since Zachary Taylor:
Trump’s success as a politician owes a lot to his conspicuous disregard for the language of public life, of course. But when he tweets, he exposes himself as someone who has only a tenuous acquaintance with that language in its written form — not just as a man who doesn’t read books, but as a man who doesn’t read. Sealed in the bubble of his orality, he’s cut off from history, from biography, from sciences hard and soft.
That’s no impediment to running a large company, but it seriously impairs his ability to run a country, particularly if he’s at pains to deny or conceal it.