And we all know how that turned out.
Iranian President Hassan Rouhani should take a lesson from the Kim-Trump summit in Singapore:
Go back to the negotiating table.
Chances are, you'll get a better deal with Trump than the one with Obama that Trump broke.
And, as an added bonus, you can break any deal with Trump because he will have boasted about his huge success and won't admit how bad the deal was -- for the United States.