India, April 28 -- US secretary of state Marco Rubio said additional pressure could be imposed on Iran if no deal is reached, stressing that the final decision rests with US President Donald Trump.

"That's POTUS' decision to make. the level of sanctions on Iran is extraordinary, the level of pressure on Iran is extraordinary, and I think more can be brought to bear," said Rubio in an interview with Fox News.

Little progress has been made since a fragile ceasefire took effect in early April. Talks in Islamabad yielded no breakthrough, and speculation about a second round of direct negotiations faded after Iran's foreign minister Abbas Araghchi left Pakistan before a US delegation arrived.

Iran has reportedly submitted a new proposal tha...