Yes or No: Did Bolton Give Testimony in the Plame Case?

It's not a difficult question. MSNBC has reported that John Bolton appeared before the grand jury in the Valerie Plame case. Bolton's response to a broadly worded question ("Have you been interviewed or asked to supply any information in connection with any administrative (including an inspector general), Congressional or grand jury investigation within the past 5 years?") from the Senate Foreign Relations Committee was "no".
Joe Biden would like an answer:

In a letter to Rice, Sen. Joseph Biden, D-Del., referenced an MSNBC report from July 21 that Bolton was among State Department undersecretaries who "gave testimony" about a classified memo that has become an important piece of evidence in the leak investigation.
Biden asked Rice to tell the committee "whether Mr. Bolton did, in fact, appear before the grand jury, or whether he has been interviewed or otherwise asked to provide information by the special prosecutor or his staff in connection with this matter."

Think Progress has the letter.