A senior Republican senator is seeking an investigation into potential conflicts of interest among former Goldman Sachs executives serving at the US Treasury and whether any officials exceeded their authority by implementing a controversial tax change without the approval of Congress.
Chuck Grassley, the most senior Republican on the Senate finance committee, asked Eric Thorson, inspector-general of the Treasury, to investigate the "independence" of several Treasury officials who formerly worked at Goldman Sachs and serve as advisers to Treasury secretary Hank Paulson, the former chief executive of the Wall Street bank.

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