The hardliners of the U.S.A. are pressuring the moderates in Iran to withdraw from the Obama nuclear deal.
"Iran nuclear deal: what has Tehran said and what happens next?
[...]
Europe collectively has heavily invested in diplomacy with Iran and regards the nuclear deal as the high-water mark of multilateralism."
Under Trump the U.S.A. has flipped.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”