Khamenei's body to leave Iran, what's the hidden reason?

Iran has announced plans to transfer the late Supreme Leader Ali Khamenei's body to Iraq on July 8 for state funeral processions in Baghdad, Karbala and Najaf before returning it to Iran for burial at the Imam Reza Shrine in Mashhad. The ceremonies are expected to involve senior Iraqi leaders and mark a major cross-border state tribute following several days of mourning in Iran.