What is the Iran nuclear deal?

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The Iranian nuclear agreement was struck in 2015 under the Obama administration. It prevented Tehran from developing materials that could be used to produce a weapon, but allowed it to pursue domestic power generation. Donald Trump announced on Tuesday he wanted to scrap it
What is the Iran nuclear deal and why does Trump want to scrap it?
View the video at https://www.theguardian.com/world/video/2018/may/08/what-is-the-iran-nuclear-deal-video-explainer