WASHINGTON — A top US diplomat who reportedly compared a tough new immigration law in Arizona to China's rights record must retract his "offensive" remark and apologize, the state's two US senators demanded Tuesday. Republican Senators Jon Kyl and John McCain accused Assistant Secretary of State Michael Posner of implying that the Arizona measure "is morally equivalent to China's persistent pattern of abuse and repression of its people." The letter from McCain and Kyl, obtained by AFP, cited a media report that Posner had called Arizona's controversial immigration measure part of "a troubling trend in our society" during recent US-China...