US President Donald Trump has said he had secured guarantees from Iran that it would not develop nuclear weapons, as reports emerged he had sent a tougher peace proposal back to Tehran, AFP reports.

“The one guarantee that I have to have is that there will be no nuclear weapons. They’ve agreed to that, and it was very interesting,” he told his daughter-in-law Lara Trump in an interview broadcast on her Fox News programme on Saturday night.

But Tehran has previously cast doubt on Trump’s assertions and the parties appeared far apart on their key priorities.