alice porter reports. its defiance against the 2015 nuclear deal — an agreement designed to contain iran's development of nuclear technology. the regime breached the terms by going over the stockpile limits set for low enriched uranium. now events have gone one step further. at a news conference in tehran, senior officials said they would soon exceed the level of uranium enrichment set out in the deal. translation: in a few hours' time, technical work will conclude and the process of proliferation above 3.67% will start. we expect that tomorrow morning, when the iaea take samples, we will have gone beyond 3.67%. iran says there is still opportunity for talks, but european leaders may not be so hopeful. during an hour—long call with the iranian leader, the french president expressed strong concern about the consequences of abandoning the deal. so how did we get to this position? just over a year ago, donald trump upended the agreement and the us imposed tough economic sanctions on iran, severely damaging it