I'm torn as I think giving it at the White House would be equally powerful, as it would remind all his enemies that he's still there, still in the White House.
But I do think giving the speach would be super epic, it would be off the charts to have it there, considering its history.
Compare either location with that senile prick Biden. giving his acceptance speach from his basement.
Gettysburg Or Fort Sumter??
I can see the significance of either; but the boats surrounding Fort Sumter would be a sight to behold. And there is nothing more exciting than Trump touching down for an event.