[Sources: U.S. Low Credibility Prompts Iran's Tough Stance] Odaily Planet Daily reports, according to Iran's Mehr News Agency, a source from the Iranian negotiation team stated: "The U.S.'s history of unreliability and lack of trust has prompted Iran to adopt a highly tough stance. The current situation is that the U.S. is worried about war, while we are concerned about the agreement. Based on past experiences, we must strive to ensure tangible benefits." (Jin10)