Washington DC, May 2 -- US President Donald Trump on Saturday (local time) said he is reviewing a newly submitted proposal from Iran, but signalled deep scepticism about its prospects, arguing that Tehran has not "paid a big enough price" for its past actions.

In a post on Truth Social, Trump said, "I will soon be reviewing the plan that Iran has just sent to us, but can't imagine that it would be acceptable in that they have not yet paid a big enough price for what they have done to Humanity, and the World, over the last 47 years."

The post came shortly after Trump spoke to reporters while boarding Air Force One in Florida, where he was asked whether he had seen the 14-point proposal.

When pressed, Trump responded, "No,I haven't. I'm ...