But it's not a joke. We've had a decade of reports with insiders indicating he doesn't read daily briefings. https://www.businessinsider.com/trump-looks-at-charts-in-int...

Can he read? No doubt he can read some. I can't say he's illiterate. But functionally, he's nowhere near the reading and comprehension skills of what we should expect from a national leader.

Can't edit but... an adult who grew up in the US their entire life who can't read out "acetaminophen" or "yosemite" is certainly under-literate.