The US president insists Washington has already decimated Tehran in a “very conventional way” US President Donald Trump has lashed out at a reporter who asked whether his threats to destroy Iranian civilization meant he was ready to use a nuclear weapon, dismissing the question as “stupid.” The exchange took place at the White House on Thursday, where a journalist recalled Trump’s April 7 warning that “a whole civilization will die tonight, never to be brought back again” if Tehran did not accept his terms, a remark widely condemned as apocalyptic and potentially genocidal. “Why would a stupid question like that be asked? Why would I use a nuclear weapon when we’ve totally, in a very conventional way, decimated them without it? No, I wouldn’t use it,” Trump said, adding that a “nuclear weapon should never be allowed to be used by anybody.” .…