US officials will raise American trade issues with Chinese officials at a Sino-US trade summit on April 11, Reuters reported. US Trade Representative Rob Portman promised a tougher line on enforcing the provisions laid down by the World Trade Organization. Portman indicated that if the US decided to charge China at the WTO for trade infraction, top of the list would be the alleged obstruction to the import of American auto parts. Another key issue is piracy of US movies and software. "As a mature and successful member of the global trading system", China must be held to a higher standard than it has been, Portman said.