Since the 1979 Islamic Revolution, Iran's stance towards Israel and its Western allies has been nothing if not consistent, says Iran expert Karim Sadjadpour. In an extensive interview with Ian Bremmer for GZERO World, Sadjadpour emphasizes that Iran has consistently invested substantial resources in supporting militant groups like Hamas, Islamic Jihad, and Hezbollah in an effort to undermine Israel. It's a continuation of Iran's long-term strategy to challenge the existence of Israel.