WASHINGTON, June 6, 2018 (Xinhua) -- Kathleen Kennedy Townsend, daughter of Robert F. Kennedy, speaks during a public memorial for Robert F. Kennedy at the 50th anniversary of his assassination at Arlington National Cemetery in Arlington, Virginia, the United States, on June 6, 2018. (Xinhua/Ting Shen/IANS)moreWASHINGTON, June 6, 2018 (Xinhua) -- Former U.S. President Bill Clinton speaks during a public memorial for Robert F. Kennedy at the 50th anniversary of his assassination at Arlington National Cemetery in Arlington, Virginia, the United States, on June 6, 2018. (Xinhua/Ting Shen/IANS)moreWASHINGTON, June 6, 2018 (Xinhua) -- Former U.S. President Bill Clinton speaks during a public memorial for Robert F. Kennedy at the 50th anniversary of his assassination at Arlington National Cemetery in Arlington, Virginia, the United States, on June 6, 2018. (Xinhua/Ting Shen/IANS)more