Congress has lowered the salary for America's most senior diplomatic post to keep Mrs Clinton's nomination within the US constitution.
A section of the latter called the Emoluments Clause states that no member of Congress can be appointed to a government post if that job's pay was increased during the lawmaker's current term.
Mrs Clinton, a New York senator, might have been ineligible to serve as secretary of state because she was serving in Congress when Miss Rice's salary was raised to its current level of $191,300.
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