Both Trump and Biden meet the full DSM-5 (official psychiatric diagnostic manual) criteria for ADHD. https://dockruse.medium.com/yes-joe-biden-has-adhd-too-daf305a7e597 They both have a tendency to speak what's at the top of their mind, which has made both of them gaffe prone. It is certainly possible that either one of them may also have some form of dementia compounding the executive function deficits created by ADHD, but this requires that we can demonstrate a clearly diminished abilities compared to their baseline. https://medium.com/politically-speaking/is-biden-cognitively-sound-fc8726a34d11 Picking out isolated malapropisms or non sequiturs doesn't qualify, particularly when an individual may be tired or stressed. Having ADHD does not mean someone is stupid or incompetent, and we all need to do a better job of recognizing it when it is present.