Washington / Tehran, May 11 -- US President Donald Trump outrightly rejected Iran's counter-proposal aimed at ending the months-long war and termed Tehran's response "totally unacceptable".

"I have just read the response from Iran's so-called 'Representatives.' I don't like it - TOTALLY UNACCEPTABLE!" Trump wrote in a post on Monday.

The rebuke came as both sides, who have been trying to negotiate since April, are trying to reach a deal over Iran's nuclear program and the terms of any potential ceasefire agreement.

Iran's counter-proposal, delivered through Pakistan mediators, mentions a series of sweeping demands: the lifting of US sanctions, the release of frozen Iranian assets, and formal recognition of Iranian sovereignty over the St...