Trump clearly knew that Powell would not listen to him, but also continued to shout across the air. The main reason might be to create an opposite. Creating the Fed and Powell was to drag the risk market back and let the United States point out the reasons for more debt. From the public opinion, he put pressure on the Fed and Powell, and won the support of more Fed directors, so that the market had the illusion that if the economy or the risk market went wrong, Powell would not cut interest rates.