President Trump landed in Beijing on Wednesday evening local time to meet with Chinese President Xi Jinping at a crucial moment in Mr. Trump's presidency amid the war with Iran and uncertainty about the economy.  "We're the two superpowers," Mr. Trump told reporters as he departed the White House on Tuesday. "We're the strongest nation on Earth in terms of military. China's considered second." Mr. Trump was greeted by Chinese officials at the airport in Beijing for an arrival ceremony. The U.S.