They did for several months, expecting the US to demand a return to the deal. They figured someone would talk common sense into Trump. The deal always unilaterally benefited the US anyway. The entire deal was a scheme in which Iran would have their own assets (stored in international banks) unfrozen and returned to them, in exchange for Iran staying below a certain threshold of enriched uranium. They never made a nuke, and they never wanted to make a nuke that bad anyway. They just wanted a nuclear power grid that was less reliant on coal, oil, and gas from the west. The entire fear mongering about them making a nuke was just western racism, and the real policy goal was to keep them reliant on western fossil fuels. That's why their top nuclear scientist was assassinated. It was about energy, not weapons.