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By Ginger Gibson WASHINGTON (Reuters) - Presidential candidate Donald Trump and the U.S. Chamber of Commerce on Wednesday continued to diverge sharply on trade policy, the latest example of divisions within the Republican Party that threaten unity ahead of the Nov. 8 election. Trump struck back the following day. "Why would the US Chamber be upset by the fact that I want to negotiate better and stronger trade deals or that I want penalties for cheaters?" the wealthy businessman wrote on Twitter.