Iran says it will only sign up to a final nuclear deal, if all sanctions imposed on the country are lifted and all at the same time. <br /><br /> It comes after a preliminary agreement was struck in Switzerland last week, which aims to curb Tehran’s disputed atomic work.<br /><br /> “We will not sign any deal unless all economic sanctions are immediately lifted on the same day,” said president Hassan Rouhani. <br /><br /> But his words are at odds with the US, which says the sanctions would have to be phased out gradually.<br /><br /> The White House is in the midst of trying to persuade lawmakers and critics at home that the initial deal struck in Switzerland is the right one.<br /><br /> Secretary of State John Kerry is making it clear that Iran must reveal details about its nuclear programme.<br /><br /> “They have to do it. It will be done. If there’s going to be a deal, it will be done,” he said. <br /><br /> The deadline for reaching a final nuclear deal is the end of June and there are still many details to work out.<br /><br /> The world powers involved ar
