evidence: Beyond the Summits, the Obama Administration’s other major achievement on the counterproliferation front was to cut off pathways to a bomb for one of the world’s leading state sponsors of terror. During its march over the previous decade to the point at which it was approaching a "break-out capability," Iran had crossed a dozen red lines. Thanks to an imaginative and determined negotiating strategy led by the United States, in 2015 the Permanent Five members of the Security Council and Germany concluded with Iran the Joint Comprehensive Plan of Action (JCPOA). The JCPOA verifiably interrupted all of Iran’s major pathways to a weapon by preventing Iran from reprocessing plutonium or enriching uranium beyond 3.75 percent (weapons-grade uranium is enriched to 90 percent). Furthermore, by eliminating two-thirds of Iran’s current centrifuges and 98 percent of its enriched-uranium stockpile, the agreement pushed Iran back at least a year from a bomb.22 Though critics still complain that the JCPOA allows too much space for Iran to "cheat," the deal imposes the most intrusive verification and inspection regime ever negotiated. This inspection regime substantially reduces the likelihood that Iran either acquires nuclear weapons itself or sells nuclear material to terrorist groups. [...] 21 National Academies of Sciences, Engineering, and Medicine, Reducing the Use of Highly Enriched Uranium in Civilian Research Reactors (Washington, DC: The National Academies Press, 2016), available at <https://www.nap.edu/catalog/21818/reducing-the-use-of-highly-enriched-uranium-in-civilian-research-reactors>.