The Securities and Exchange Commission needs to undertake a “comprehensive, independent, zero-based regulatory review” of a broad range of market structure issues before “piecemeal changes to the current market structure” exacerbate potential execution unfairness and make matters worse, says U.S. Sen. Edward E. Kaufman (D-Del.).

In a letter sent Monday to SEC Chairman Mary Schapiro, Kaufman said he is concerned that questionable practices will “further erode investor confidence in our financial markets” because regulatory actions have failed to keep up with changes.

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