Donald Trump's trade advisers were finalizing plans on Wednesday for the reciprocal tariffs the U.S. president has vowed to impose on every country that charges duties on U.S. imports, ratcheting up fears of a widening global trade war and threatening to add to already-sticky U.

Chinese tariffs on U.S. products including LNG, coal and agricultural equipment were imposed Monday, in response to Trump’s 10 percent blanket levy.

U.S. President Donald Trump said he plans to unveil reciprocal tariffs on Thursday afternoon but gave no details about his latest tariff plan, which could take aim at every country that charges duties on U.