Just like every thing else that comes out of the Gang That Couldn't Shoot Straight they are giving mixed signals that confuse enemies and allies alike. And the really stupid thing here is Iran has an election coming up. And the entire country has been moving toward electing moderates. And a stupid move like this is all it would take to let the hardliners take over again. Also how is Trump supposed to blow up an agreement that was approved by 5 other countries?