Stakes are very high as European foreign ministers leave talks with their Iranian counterpart in Geneva, a former UK ambassador to the US has said.
Speaking to Jonathan Samuels, Sir Peter Westmacott said the talks are so important "because they have got to discuss with the Iranians whether they want to make an offer on the whole issue of enrichment and the dismantling of the Iranian nuclear programme".
But over in the US, Westmacott explained that the Republican opinion on Iran is divided.
"You've got the MAGA base who like to remind the president that he was elected on a platform of ending wars and not starting wars," he said.
"But you've also got... the more traditional Republican party who think here is an opportunity to not only kill off the enrichment, the nuclear programme, but deliver regime change."
Watch the full interview in the video below.