From the Times-Picayune ...

The "D.C. Madam" served a subpoena Tuesday on Sen. David Vitter, R-La., requiring him to testify about his use of the Washington, D.C., escort service federal prosecutors say was a prostitution ring.

The subpoena calls on the freshman senator to testify at a federal court hearing Nov. 28 looking into the business operations of the $2 million escort service Deborah Jeane Palfrey operated in the nation's capital for 13 years.

Vitter has acknowledged being a client of Palfrey's company, Pamela Martin & Associates, and his telephone number appeared six times in the firm's phone records between 1999 and 2001, when he was a member of the House of Representatives. He was elected to the U.S. Senate in 2004.