U.S. President Obama pauses as he discusses unemployment, in the East Room of the White House in WashingtonBy Jason Lange WASHINGTON (Reuters) – The Obama administration is bearing in mind nominating Citigroup economist Nathan Sheets to be the Treasury Department's prime official for world affairs, in step with two sources conversant in the matter. If nominated and proven through the Senate, Sheets could be a key determine in U.S. financial and economic diplomacy and would help lead world discussions on the worldwide financial system. As the Treasury's underneath secretary for global affairs, Sheets must container questions from rising market nations whose markets are reeling from a dramatic reversal of money flows tied partly to the U.S. Federal Reserve's choice to curtail its financial stimulus. He would additionally get an earful from creating countries annoyed through U.S. intransigence in following via on a promise to present emerging economies an even bigger say at the International Financial Fund.