US President Donald Trump has said a deal with Iran was "very possible" but threatened to again bomb the country if negotiations fell apart. Despite Trump's optimism, Iran has yet to respond to a new US proposal, with its chief negotiator warning that Washington was seeking to force the Islamic republic's "surrender." Positive signs that the foes could return to the table after weeks of deadlock grew after Trump halted a short-lived military operation to reopen the Strait of Hormuz, citing hopes for a deal. Trump has said if "Iran agrees to give what has been agreed to," the war would be over, but if not, the bombing would resume "at a much higher level and intensity."