WASHINGTON - The administration tapped the sole Republican member of the Securities and Exchange Commission late Monday to serve as acting chairwoman until a permanent successor to Arthur Levitt is named.

The White House and the agency confirmed the appointment of Laura S. Unger, who joined the SEC as a commissioner in November 1997. Before joining the agency Ms. Unger was a securities counsel to former Senate Banking Committee Chairman Alfonse M. D'Amato.

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