Then he didn't to Trump any favors. Trump seems to think he took some kind of IQ test, that the test was "very hard", and that he aced it and he brags about it. The test in question should not be hard at all for anyone with normal cognitive skills. The only reason for giving it in the first place if you think the person being tested is losing their memory or having problems thinking. If asked about his mental fitness Jackson should just have said that the physical and his observation of Trump on a daily basis have shown no indication that Trump's cognitive skills were declining and left it at that.
Oh, he did President Trump an enormous favor. MSM, especially in the form of one Joe Scarborough, along with his Mrs., were carrying on and on about how President Trump was in decline, not the man he used to be. It really torqued me, because President Trump was obviously sharp as a tack. Sure he made a Big Deal about his score afterward, but it was never about his IQ; it was about his mental acuity. And it turned off that line of criticism like a spigot. I remember this well. I got one heck of a kick out of it, and Rush made hay of it, too.
Asking for a friend.