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Rates on shortest bills surge as Fitch places U.S. rating on negative watch.
Bank hopes to tap into the nation's $1 trillion in post-war infrastructure spending.
Citi is winning business from global companies tapping the U.S. market.
New CEO is expected to pare bank's holdings and overhaul management.
Both CEO Pandit and President John Havens are gone while Citigroup brings in new team.