President Donald Trump maintained on Tuesday that an interim accord with Iran makes clear that Tehran would never be allowed to develop a nuclear weapon.
Speaking ahead of talks with Qatar's Emir Sheikh Tamim bin Hamad Al Thani on the sidelines of the G7 summit in France, Trump defended the 14-point memorandum of understanding with Iran that has yet to be made public.
"The only thing that really matters to me, is Iran will never have a nuclear weapon, and it says it loud and clear," he told reporters, warning that "all hell will rain down" on Iran if it sought to acquire one.
U.S. and Iranian officials are due in Switzerland on Friday to begin detailed negotiations, opening a 60-day window for complex technical talks. These are expected to cover issues such as the future of Iran's highly enriched uranium and the lifting of sanctions.