Washington, May 31 -- Days after declaring a proposed agreement with Tehran "largely finalised", US President Donald Trump has reportedly returned the draft text for extensive modifications, extending the diplomatic process and injecting fresh ambiguity into efforts aimed at halting the confrontation.

According to CNN, Trump requested tougher provisions on Iran's nuclear commitments and the reopening of the Strait of Hormuz during a meeting with advisers.

The US President has reportedly also expressed concern over the extent of financial relief that could be offered to Tehran under any agreement, wary of comparisons with the Obama-era nuclear deal, which he has repeatedly criticised as too lenient.

The latest round of changes comes a w...