As President Donald Trump's 48-hour deadline ticks down, Tehran has responded to his threat to "obliterate" Iranian power plants with a threat of its own — and shown no signs of backing down. Iran's Revolutionary Guards have now declared that energy facilities in countries hosting US bases will be "lawful targets" if Trump follows through.Writing on Truth Social, Trump warned he would "hit and obliterate" Iran's power plants "starting with the biggest one first" unless Tehran fully reopened the Strait of Hormuz by 23:44 GMT on Monday. Around 20% of the world's oil passes through the narrow waterway, which has…