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U.S. Senator Bernie Sanders (front) speaks during a rally against the Republican tax plan on Capitol Hill in Washington D.C., the United States, on Dec. 13, 2017. (Xinhua/Ting Shen)

U.S. Senator Bernie Sanders (front) speaks during a rally against the Republican tax plan on Capitol Hill in Washington D.C., the United States, on Dec. 13, 2017. (Xinhua/Ting Shen)