India, May 9 -- A hardline faction inside Iran has stepped up its opposition to ongoing negotiations with the United States. This domestic resistance comes as talks between Tehran and Washington reach a critical peak.

The US, earlier this week, delivered a one-page memorandum to Iranian officials for review. While Washington awaits a formal reply, the hardline group, known as 'The Endurance Front' has launched a public campaign to block any potential agreement, CNN reports.

The group is formally known as 'Jebhe-ye Paydari' (Endurance Front). It is reportedly an ultra-conservative political faction in Iran.

It identifies itself as a defender of the 1979 Islamic Revolution, which replaced the Shah's pro-Western monarchy with an Islamic R...