President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE on Monday slammed China’s trade practices as “stupid” rather than free and fair.

“When a car is sent to the United States from China, there is a Tariff to be paid of 2 1/2%. When a car is sent to China from the United States, there is a Tariff to be paid of 25%,” the president wrote on Twitter.

“Does that sound like free or fair trade. No, it sounds like STUPID TRADE — going on for years!”

When a car is sent to the United States from China, there is a Tariff to be paid of 2 1/2%. When a car is sent to China from the United States, there is a Tariff to be paid of 25%. Does that sound like free or fair trade. No, it sounds like STUPID TRADE - going on for years! — Donald J. Trump (@realDonaldTrump) April 9, 2018

Washington and Beijing have exchanged tariff threats in recent weeks.

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The Trump administration last week said it plans to enact tariffs on about $50 billion worth of Chinese imports, causing China to respond with its own $50 billion tariff package aimed at U.S. goods, including automobiles.

China had earlier announced another tariff package targeting U.S. pork and fruit in response to Trump's decision to raise levies on imported steel and aluminum.

The back and forth has caused concerns over a possible trade war — fears Trump has rejected.

Treasury Secretary Steven Mnuchin Steven Terner MnuchinShutdown clash looms after Democrats unveil spending bill Lawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid MORE, however, said Sunday that there could be a trade war, though he does not expect one.