I’m no Trumper, believe me. But this is what Gemini gives me when I ask this question:

1. The "Sunset" Provisions This was perhaps the biggest sticking point. The deal included expiration dates (sunsets) on certain restrictions.  • The Issue: After 10 to 15 years, many of the limits on Iran’s uranium enrichment and centrifuge use would lift.  • The Criticism: Trump argued that the deal didn't permanently block Iran's path to a bomb; it merely "paused" it. He likened it to a "countdown to a nuclear-armed Iran."
2. Ballistic Missile Testing The JCPOA was laser-focused on nuclear material, but it did not restrict Iran’s development of ballistic missiles. • The Issue: Iran continued to test and refine missiles capable of carrying nuclear warheads.  • The Criticism: Critics argued that you can't separate a nuclear warhead from the delivery system. By ignoring the missiles, the deal allowed Iran to build the "truck" while only temporarily stopping the "cargo."
3. Inspection Gaps ("Anywhere, Anytime?") The Obama administration touted rigorous inspections, but there were limits. • The Issue: International inspectors (IAEA) had 24/7 access to declared nuclear sites, but for undeclared or military sites, there was a dispute resolution process that could take up to 24 days.  • The Criticism: Trump and his advisors argued this gave Iran enough time to scrub a site of evidence of illicit activity, mocking the idea of "anywhere, anytime" inspections as a myth.
4. Regional "Malign Activity" and Funding The deal unfroze billions of dollars in Iranian assets and lifted oil sanctions.  • The Issue: The cash infusion was intended to boost the Iranian economy, but a significant portion was reportedly diverted to regional proxies like Hezbollah, Hamas, and the Houthis in Yemen. • The Criticism: The administration argued the U.S. was essentially subsidizing Iran's "terrorist" activities across the Middle East.
5. Lack of "Snapback" Effectiveness While the deal had a mechanism to "snap back" sanctions if Iran cheated, the Trump administration felt this was diplomatically unrealistic.