U.S. President Donald Trump has sparked outrage online after he was caught on camera joking about the sinking of Iran’s warship IRIS Dena, even as U.S. troops are being killed in the wider conflict with Tehran. In the clip, Trump mocks the ship that was torpedoed by a U.S. submarine in the Indian Ocean near Sri Lanka, where scores of Iranian sailors died after the frigate went down. His remarks come days after Iran vowed revenge for the “martyrdom” of its sailors and linked the loss of IRIS Dena to fresh missile and drone attacks under its Operation True Promise 4 campaign. Watch for more