JD Vance said the U.S.-Iran memorandum is only about a page long and key terms will be settled in technical talks before a planned Friday signing in Geneva.
The draft accord aims to end the war by reopening the Strait of Hormuz, lifting the U.S. naval blockade and offering Iran incentives — including a $300 billion reconstruction fund backed by Gulf states — if it meets benchmarks.
Senate Republicans said they still lack basic briefings on the deal, with Majority Leader John Thune and Senator Thom Tillis questioning how compliance would be enforced and whether Congress will get to review the text.
Unreleased provisions on Iran's nuclear program remain the biggest gap, including who would verify compliance and remove highly enriched uranium believed buried at sites damaged by U.S. strikes last summer.
The dispute revives tensions from the 2015 nuclear deal that Trump later abandoned, making any sanctions relief or release of frozen Iranian funds politically sensitive again.