Google appears to have blocked AI search results for the query "does trump show signs of dementia" as well as other questions about his mental acuity, even though it will show AI results for similar searches about other presidents. Similar searches about Trump are limited in the same way. Various queries about dementia, Alzheimer's, and senility display no AI overview and only produce a list of links inside AI Mode. Google's behavior is inconsistent if you swap in different names. When asking "does biden show signs of dementia", Google doesn't show an AI Overview at all: