Iranian media says agreement could still be cancelled due to US 'obstruction'published at 18:35 BST
Iran's semi-official news agency Tasnim reports that the US is obstructing some clauses of a potential agreement, including on releasing Iran's frozen assets.
It says that this means there is "still a possibility" that the agreement may be "cancelled".
Earlier, President Trump said negotiations towards a deal were "constructive" but that both sides "must take their time and get it right".













