One of Trump's assistants threatened to increase tariffs, which caused the US stock market and the US dollar to collapse. At the same time, the US dollar index also fell to the 107 range. Then they came out to refute the rumor and said it was not true. In fact, this is a common trick used by the United States to release news through the media to test market changes, and to meet expectations by saying "wolf is coming". By the time it really happens, everyone will be used to it, thus avoiding major fluctuations caused by the introduction of policies.