Photo taken on July 14, 2020 shows the U.S. Supreme Court building in Washington, D.C., the United States. The United States carried out its first execution at the federal level on Tuesday, putting white supremacist and murderer Daniel Lewis Lee to death by lethal injection. (Xinhua/Liu Jie)

Photo taken on July 14, 2020 shows the U.S. Supreme Court building in Washington, D.C., the United States. The United States carried out its first execution at the federal level on Tuesday, putting white supremacist and murderer Daniel Lewis Lee to death by lethal injection. (Xinhua/Liu Jie)

Photo taken on July 14, 2020 shows the U.S. Supreme Court building in Washington, D.C., the United States. The United States carried out its first execution at the federal level on Tuesday, putting white supremacist and murderer Daniel Lewis Lee to death by lethal injection. (Xinhua/Liu Jie)

Photo taken on July 14, 2020 shows the U.S. Supreme Court building in Washington, D.C., the United States. The United States carried out its first execution at the federal level on Tuesday, putting white supremacist and murderer Daniel Lewis Lee to death by lethal injection. (Xinhua/Liu Jie)

Photo taken on July 14, 2020 shows the U.S. Supreme Court building in Washington, D.C., the United States. The United States carried out its first execution at the federal level on Tuesday, putting white supremacist and murderer Daniel Lewis Lee to death by lethal injection. (Xinhua/Liu Jie)