China said it had started an antitrust investigation of Google, which works with Chinese companies on smartphones and advertising outside the country.

China announced retaliatory tariffs on select American imports and an antitrust investigation into Google on Tuesday, just minutes after a sweeping levy on Chinese products imposed by U.S. President Donald Trump took effect.

Donald Trump’s quest to reform the United States economy by implementing tariffs is moving quickly. The U.S. President had barely been back in the White House for a week when he started taking steps toward levying tariffs against Canada,