theprestige
Penultimate Amazing
He is the worst in killing the most innocent people by sheer self absorption and negligence... for no logical reason.
I think a case could be made for several presidents along those lines. Bay of Pigs comes to mind, for example, but this isn't really the thread to hash it out.
This is more the thread for you to brainstorm what clever nickname most effectively sells the "Trump is the worst president" concept.