The former US president Jimmy Carter has called for his country to resume trade relations with Iran, which he described as a "rational" nation. Speaking at the Hay Festival yesterday, Mr Carter also suggested the US should provide nuclear power technology and fuel to Iran as a show of goodwill. "What happens if, in three years time, Iran has a nuclear weapon," Mr Carter asked. "I'm not sure that is going to happen, but if it does, what do we do? They are rational people like all of us in this room. Do they want to commit suicide?