A senior Iranian official told CNN the new nuclear deal proposal presented to Tehran in recent days is “incoherent and disjointed,” as sources familiar with the progress of the talks said the momentum behind negotiations to secure a new deal appears to be collapsing.

Iranian, Egyptian and U.N. leaders have met to discuss Iran’s nuclear program after the U.N. nuclear watchdog agency said Iran is increasing its stockpile of uranium enriched to near weapons-grade levels.

President Trump claimed Monday that the U.S. won't allow Iran to enrich uranium under a potential nuclear deal. Why it matters: Trump's claim contradicts the proposal his envoy Steve Witkoff made to Iran on Saturday,

Iran carried out secret nuclear activities with material not declared to the U.N. nuclear watchdog, the confidential report said.

The U.N. nuclear watchdog says Iran has further increased its stockpile of uranium enriched to near weapons-grade levels.

Iran lashes out at Austria after a report claims Tehran has an advanced nuclear weapons program, sparking diplomatic tensions and calls for explanations.

Iran is poised to reject a U.S. proposal to end a decades-long nuclear dispute, an Iranian diplomat said on Monday, slamming it as a "non-starter" that fails to address Tehran's interests and leaves Washington's stance on uranium enrichment unchanged.

With a solid backing from American voters, President Trump has given Iran fair warning of repercussions if Tehran doesn’t halt its nuclear ambitions.