U.S. President Donald Trump posted a threat on his social media platform Saturday, warning of a devastating military response against Iran following open calls for his assassination at the funeral of Supreme Leader Ayatollah Ali Khamenei. The remark came as senior American officials demanded Iran publicly guarantee that the Strait of Hormuz remains open to shipping, after Tehran attacked three vessels there earlier in the week. Tehran has refused, insisting on control and the right to charge ships transiting the waterway. The exchange follows days of U.S. airstrikes on Iran and Iranian retaliatory fire across the Middle East, escalating a confrontation that threatens an interim ceasefire agreement.