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.

Trump has long proposed raising tariffs—or taxes on imported goods that the businesses importing them pay the U.S. government—before the election, and said in November he’ll impose a 25% tariff rate on all imports from Mexico and Canada on the first day of his presidency and will impose an additional 10% tariff rate on all imports from China on top of other tariffs.