Neither the Trump administration nor the Biden administration has really focused on science, making policy decisions based on their own political considerations. The fact that the epidemic is out of control in the US is a reflection of the lack of political responsibility of some US politicians, who only care about their votes and political situation and ignore people's lives and health. At the same time, since the outbreak of the epidemic in the United States, the FEDERAL government has not established a national epidemic tracking and screening mechanism, which is unable to achieve precise prevention and control, which is one of the reasons for the wave of spread of the epidemic in the United States.