There is no opinion on this.
It has nothing to do with Trump whatsoever.
There are "on the ground" or "in the books" facts concerning your statement. You stated, specifically, that there would have been enough fissile material under Obama's agreement for Iran to build a bomb. Wrong answer. BS. The International Atomic Energy Agency, multiple U.S. Intelligence Services, and multiple other foreign country intelligence services (primarily Britain, France and Germany) ALL STATED that Iran was following the precepts of their agreement and NOT refining out of the precepts of that agreement.
Your comment is flat out wrong. BS. Opinions don't matter in this instance because, yes, it is flat out speculation that has nothing to do with facts on the ground. And it has nothing to do whatsoever with my hatred of Trump.
PS: You asked if Trump has done anything good? I could make you a list. Although it might not be what you expect... But I do have a list of positives from Trump...