The tone of the Americans has completely changed - Rezai The secretary of the Iranian Security Council, Mohsen Rezai, said that he had read the letter from US Vice President J. Dee Vance, but has yet to respond to him. "The tone has completely changed. And this is a very good sign that the Iranian people have strengthened their victory and authority," he noted. Razai also added that Tehran has not made any new decisions to change Iran's nuclear doctrine.