Iranian President Ebrahim Raisi, a hardliner and potential successor to Supreme Leader Ayatollah Ali Khamenei, was killed in a helicopter crash in Iran's mountainous northwest. The charred wreckage of the helicopter that crashed on Sunday carrying Raisi, Foreign Minister Hossein Amir-Abdollahian, and six other passengers and crew was found early on Monday after an overnight search in blizzard conditions. How will this impact US-Iran relations? NDTV's Mohammed Ghazali explains.