Trump Convenes Top-Level Situation Room Meeting on Iran Nuclear Deadlock May 18; No Deal in Sight; Hormuz Blockade Enters Week 11

President Trump convened a top-level Situation Room meeting on May 18, 2026, gathering national security principals to address the deepening Iran nuclear and ceasefire deadlock — the administration's most senior deliberative body convened explicitly on the Iran nuclear impasse. The meeting follows: Trump's May 12 declaration that the Iran ceasefire was 'on massive life support'; his rejection of Iran's revised MOU proposal as 'totally unacceptable' on May 11; the May 16 EU3 (UK, France, Germany)–Iran Istanbul talks that opened a parallel European diplomatic channel (first since the April ceasefire); and Iranian FM Araghchi's May 15 statement that Tehran 'doubts US seriousness' about negotiations. The Strait of Hormuz blockade continues into its 11th week as of May 18 — approximately 750 vessels remain trapped; approximately $6 billion per month in Iranian oil export revenue is blocked; U.S. average gas prices stand at $4.48/gallon (highest since July 2022). The core nuclear enrichment impasse is unresolved: the U.S. demands a 20-year moratorium on high-level enrichment; Iran offers 5 years; a 12-year compromise that had been explored was politically foreclosed when 52 U.S. senators and 177 House members wrote Trump on May 14 opposing any deal permitting enrichment. Iran holds 400–460 kg of uranium enriched to 60%, upgradeable to weapons-grade within one to two weeks. Iranian parliamentary leaders (Ghalibaf, Rezaei) have publicly threatened enrichment to 90% if Iran faces new military strikes. Special Envoy Witkoff warned on May 15 that Iran remains 'near making nuclear bomb material.' The EU3 Istanbul track continues as Tehran's diplomatic hedge but has produced no breakthrough on the core enrichment question. The Situation Room convening signals maximum administration-level attention to the Iran file as the de facto ceasefire — maintained without a formal legal successor agreement — approaches seven weeks with no clear resolution path.