Protesters confront police near the White House during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

Protesters rally during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

Police stand guard near the White House during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

Protesters rally near the White House during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

A protester confronts police near the White House during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

A protester carries a sign during a protest over the death of George Floyd near the White House in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

Protesters rally during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

Protesters confront police near the White House during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

Protesters run away when police move forward near the White House during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)

Protesters rally near the White House during a protest over the death of George Floyd in Washington D.C., the United States, on May 30, 2020. Demonstrations and riots have spread to cities across the United States after a video went viral of George Floyd being suffocated to death by a white police officer in the midwest U.S. state of Minnesota on May 25. (Xinhua/Liu Jie)