>>>>Let’s say that again: POTUS has no constitutional role in constitutional amendment. NONE.<<<
Correct in part. But not in full. POTUSs appoint judges. They also do a great deal to determine the agendas that our nation pursues and act as the spokesman for the nation.
Correct in full. Judges have nothing to do with the constitutional process of amending the constitution. "Agenda determination" is not a constitutional role.