[Iran's Top Security Official: U.S. Response to Iran's Latest Proposal 'Not Sufficient'] BlockBeats News, October 11, according to Iran's Fars News Agency: The Secretary of Iran's Supreme National Security Council stated that the U.S. response to Iran's latest proposal is 'not sufficient.' The U.S. needs to clarify issues that remain unclear to the Iranian side. The U.S. has accepted some of our conditions, while other issues remain unresolved.