Trump does not think critically, and considering he is the president of the US, and has functional illiteracy he can't understand what he needs to for the job.
If a president can't do more than understand 'See Jane Run" that means he can't read.

Your wording suggests that because he can't read he can think critically.  That makes no sense, and in fact reading enhances one's ability to think critically.  In general readers have larger intellectual worlds than non-readers.  There is a relationship.


Saying "some can read, some can't, but either can think critically" is misleading, because the ability to comprehend complex written material is prerequisite for most forms of informed, analytical thought.  Especially in areas like policy, law, international affairs, and being chief executive of the United States.

Someone who can only read "See Jane Run" has extremely limited cognitive inputs for decision-making at the presidential level.  Just being able to read Heinlein does not cut it at the presidential level, and I doubt Trump can even read Heinlein.  If he ever could, those days are behind him.