Trade disputes between the United States and China are heating up, as Washington complains about Chinese auto parts and Beijing files a complaint about a new U.S. tariff law.
Monday, China went to the World Trade Organization accusing the United States of unfairly raising tariffs on 30 products including tires and kitchen appliances.
Beijing's action comes just hours after news reports said U.S. President Barack Obama would file a trade complaint over allegedly improper government subsidies for China's auto industry.
Administration officials say Mr. Obama will announce the move during a campaign speech in the state of Ohio.
Ohio is home to many autoworkers, and is seen as a vital political battleground in the race between Mr. Obama and his Republican rival Mitt Romney for the presidency.
The Democrats and Republicans have been accusing each other of failing to protect U.S. jobs in dealings with China.