President Hassan Rouhani, stepping up his defence of a nuclear deal under attack by Iran's conservatives, said on Thursday the historic agreement with world powers was 'more valuable' than a domestic debate about its fine details. 'How can one be an Iranian and not cheer for our negotiating team?' he said in a speech to a medical conference broadcast live on television. The accord reflected a new page in history that opened when Iranians overwhelmingly elected him president in 2013, he said, adding that Iranians sought an end to sanctions and policies of moderation.