People visit the Lincoln Memorial in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

A man rides a skateboard in front of the Lincoln Memorial in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

A visitor stands at the Lincoln Memorial in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People are seen in front of the Lincoln Memorial in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People pose for photos near the Lincoln Memorial Reflecting Pool in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People are seen near the Lincoln Memorial in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People sit on the steps of the Lincoln Memorial in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People are seen around the Lincoln Memorial Reflecting Pool in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People are seen around the Lincoln Memorial Reflecting Pool in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People take a walk at the National Mall in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People are seen around the Lincoln Memorial Reflecting Pool in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

A man jogs near the Lincoln Memorial Reflecting Pool in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People jog at the National Mall in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

A man jogs at the National Mall in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People visit the Lincoln Memorial in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People walk past the Lincoln Memorial Reflecting Pool in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People sit near the Lincoln Memorial Reflecting Pool in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)

People stand at the National Mall in Washington, D.C., the United States, on Nov. 9, 2020. The total number of COVID-19 cases in the United States reached a grim milestone of 10 million on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. U.S. COVID-19 case count rose to 10,018,278, with a total of 237,742 deaths, as of 1:25 p.m. local time (1825 GMT), according to the CSSE tally. (Xinhua/Liu Jie)