Trump just wants to make sure that when he finally does let lose on Iran, the same Democrats attacking him for "too much negotiationg" will then not be able to say "Boo-hoo! Why did you attck when the Mullahs were just about to come to the table!
Trump's memory may be slipping, but it seems he does remember clearly how Dems treated past Rep presidents.
Of course . . . the ultimate ironic hypocricy would be if the Democrats went ahead and whined about Trump cutting loose anyway after all of this negotiating and trying to make peace.