This kind of mispronounciation is associated with Alzheimer’s.
“Phonemic paraphasias” —the substitution of non-words for words that sound similar—are not normally seen until a patient enters the moderate to severe stages of Alzheimer’s.
Some examples of Trump’s non-words: Beneficiaries becomes “benefishes.” Renovations become “renoversh.” Pivotal became “pivobal." Obama became “obamna.” Missiles became “mishiz.” Christmas became “Crissus.” Bipartisan became “bipars.”