Article continues below advertisementDonald Trump confused his recent dementia screening for a "very hard" IQ test.The president bragged about the results of his latest cognitive exam at Walter Reed Medical Center during a gaggle with press aboard Air Force One on Monday, October 27.While en route to Japan, Trump, 79, challenged Democrats Jasmine Crockett, 44, and Alexandria Ocasio-Cortez, 36, to take the allegedly challenging exam he mistakingly thought tested his intelligence rather than the functioning of his brain.