You have oligarchy and kleptocracy and plutocracy.
none of these are accurate, except for maybe plutocracy.
Gerontocracy would be more accurate.
It's fundamentally not an oligarchy, that's just not true. Trump didn't do fuck all during his term for this exact reason. It's obviously not a kleptocracy, unless you have like, actual proof of this. Trump being a good one, but that's not a historical precedent.