Chinese President Xi Jinping (2nd R) and his wife Peng Liyuan (L) are welcomed by US President Barack Obama (R) and his wife Michelle Obama at the White House in Washington DC, the United States, Sept 25, 2015. Xi arrived in Washington, the second stop of his state visit to the United States, on Thursday after a busy two-and-a-half-day stay in Seattle. [Photo/Xinhua]