With Iran’s foreign ministry saying “the main part of the text was almost finalised”, US Congressman Ryan Zinke notes that “the devil’s in the details”.

“How is verification going to take place? Who is going to be the verifying body?” Zinke tells Al Jazeera, referring to the verification of Iran’s stockpile of enriched uranium.

“So I think Iran was right that nothing’s been signed. It was correct,” he says, adding, however, that the two sides appear “closer to a deal than ever”.