US President Donald Trump on Tuesday revealed previously undisclosed details about his new bunker-like White House ballroom, saying it would have a drone base on the roof and a military hospital as part of a six-storey subterranean complex. Amid the bang and clang of construction, Trump took a group of reporters on a tour of the project to try to bolster his argument that the US Congress should allocate US$1 billion to pay for security enhancements to the building. Democrats and some...