A video clip showing uniformed US military personnel on their hands and knees making last-minute adjustments to a red carpet has gone viral online, as President Donald Trump rolled out a lavish welcome for his Chinese counterpart Xi Jinping at Joint Base Andrews.The 12-second clip, which circulated widely on US social media, captured several service members hurriedly smoothing and cleaning the 30-metre (98 feet) carpet moments before Xi emerged from his aircraft.Chinese officials – including...