Did Trump just threaten genocide in Iran?

President Donald Trump’s threat against Iran marks a grave political and moral decline. Speaking about a possible expansion of the bombing campaign, he said that “a whole civilization will die tonight, never to be brought back again.” That sentence does not sound like the language of a president discussing military objectives. It presents the possible result of American action as the destruction of a civilization. Once a president speaks in those terms, accusations of genocidal threat cease to b...