With the Iran Nuclear deal, all four of the Iran pathways to a bomb are blocked. The deal keeps Iran from developing nuclear weapons because with the deal they only have 3.67% enrichment of Uranium, but they need 90% enriched uranium. That is a big gap between what they have and what they need to make nuclear weapons. Without a deal, Iran will be free to have 90% enriched uranium and as many centrifuges as they wish. The breakout time would also be 2-3 months, which is not a lot of time at all. However, with the deal, at least 15 years would be the breakout time for Iran. The deal will make it nearly impossible for Iran to successfully create a nuclear bomb. The Trump administration has found no evidence of Iran not holding up to the agreements.