That puts pressure on Alexandre Tombini, Ms Rousseff's nominee to head the Central Bank.

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She lost her bid in April to become the next president of the World Bank -- the first ever challenge to the U.S. nominee in the institution's history.

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For the first time in the bank's history candidates from developing countries mounted a challenge to an American nominee, though in the end Mr Kim was backed by China, India, Mexico and other big emerging markets.

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Most offer nominee services, meaning their own people will act as directors, legal owners or bank signatories for clients seeking to preserve anonymity.

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Fredrik Erixon, a former World Bank economist, told the BBC that the selection process was "anachronistic" but he still expected the White House nominee to be the successful candidate.

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