US President Barack Obama and Chinese President Xi Jinping walk over to greet children during a welcoming ceremony on the South Lawn of the White House in Washington on Friday. Andrew Harnik / AP

President Xi Jinping receives a warm welcome from Chinese working in the United States on Friday at the White House. Steve Helber / AP

The Obamas host Chinese President Xi Jinping and his wife Peng Liyuan at the White House on Friday. Jim Watson / AFP

Schoolchildren wait behind a rope hoping to get a glimpse of President Obama and President Xi before the ceremony. Evan Vucc / AP

Obama and Xi observe the welcoming ceremony at the White House on Friday. Saul Loeb / AFP

First lady Michelle Obama stands with China's first lady Peng Liyuan during the arrival ceremony at the White House. Gary Cameron / Reuters

President Xi Jinping, US Vice-President Joe Biden and Secretary of State John Kerry share a toast during a luncheon at the State Department in Washington on Friday. Mike Theiler / Reuters

Members of the media stand on a riser during the ceremony for President Xi at the White House. Andrew Harnik / AP

President Obama, flanked by Vice-President Biden, meets with President Xi and other officials on Friday in the Cabinet Room of the White House. Andrew Harnik / AP