China vows to fight U.S. 'at any cost' as trade spat worsens

Container ships docked at the Yangshan port in Shanghai.
Container ships docked at the Yangshan port in Shanghai, March 29, 2018. President Trump has instructed the U.S. trade representative to consider slapping an additional $100 billion in tariffs on Chinese goods in a dramatic escalation of the trade dispute between the two countries.