Via Justin Rood at ABC's blog, The Blotter, we learn that Louisiana Senator David Vitter, an admitted client of the so-called D.C. Madam, may be called to testify as a witness in her  upcoming criminal case:

A U.S. senator who admitted to using the "D.C. Madam" escort service is fighting a subpoena to testify at her trial –- down to the opening gavel this morning.

Defending herself against a sortie of felony charges stemming from running an alleged interstate prostitution business, Deborah Jeane Palfrey has subpoenaed Sen. David Vitter, R-La., to testify.

Vitter's telephone number appeared in the phone records of Palfrey's business for February 2001, which Palfrey had released to the media. At the time that was revealed, Vitter issued a statement confirming he had used the service.  Through his lawyer, Vitter has said he will not testify.

At a last-minute hearing Friday, U.S. District Court Judge James Robertson appeared to reject an argument by a lawyer who has represented Vitter that his client's testimony would be "totally inappropriate," reported Legal Times. The judge declined to nullify the subpoena.

The lawyer, Henry Asbill, declined to confirm that Vitter was the client in question.  Vitter's office also declined to do so, according to the New Orleans Times-Picayune. Instead it issued a brief statement from Vitter to "reaffirm how sorry I am to have hurt the people I love so deeply. . . including the people of Louisiana."

Asbill said that if forced to testify, his client was prepared to invoke his Fifth Amendment right against self-incrimination.

Clearly, Vitter doesn't want to take the stand.  We're still waiting for the Senate Ethics Committee to hold Vitter accountable.  CREW filed an ethics complaint against Vitter last July.  His GOP colleagues welcomed Vitter with "thunderous applause."