Sri Lanka, May 31 -- United States President Donald Trump said he had secured guarantees from Iran that it would not develop nuclear weapons, as reports emerged he had sent a tougher peace proposal back to Tehran.

Any tweaks to the proposal could prolong even further an agreement to formally end the Middle East war and open the Strait of Hormuz maritime route after weeks of efforts to secure a deal despite fractious rhetoric and the occasional flare-up of armed conflict.

The New York Times and Axios media outlets reported on Saturday (May 30) that Trump had sent back a new framework to be considered by Iran with "tougher" terms, though it was not immediately clear what that entailed.

Trump has said his priorities for any deal include s...