White House outlined the red lines it says Iran refused to agree on, according to an official cited by CNN

Red lines included: Ending all of its uranium enrichment. Dismantling its major nuclear enrichment facilities, which were badly damaged during a US bombing run last June. Retrieving the more than 400 kilograms of highly enriched uranium believed to be buried underground. Accepting a broader “peace, security and de-escalation framework” that includes regional allies. Ending funding for terrorist proxy groups Hamas, Hezbollah and the Houthis. Fully opening the Strait of Hormuz, and charging no tolls for passage.