I had a second session with Fitzgerald at Swidler Berlin on Feb. 5, 2004, after which I was subpoenaed to appear before the grand jury. I testified there at the U.S. courthouse in Washington on Feb. 25.

In these four appearances with federal authorities, I declined to answer when the questioning touched on matters beyond the CIA leak case. Neither the FBI nor the special prosecutor pressed me.

I have revealed Rove's name because his attorney has divulged the substance of our conversation, though in a form different from my recollection. I have revealed Harlow's name because he has publicly disclosed his version of our conversation, which also differs from my recollection. My primary source has not come forward to identify himself.

When I testified before the grand jury, I was permitted to read a statement that I had written expressing my discomfort at disclosing confidential conversations with news sources. It should be remembered that the special prosecutor knew their identities and did not learn them from me.

In my sworn testimony, I said what I have contended in my columns and on television: Joe Wilson's wife's role in instituting her husband's mission was revealed to me in the middle of a long interview with an official who I have previously said was not a political gunslinger. After the federal investigation was announced, he told me through a third party that the disclosure was inadvertent on his part.

Following my interview with the primary source, I sought out the second administration official and the CIA spokesman for confirmation. I learned Valerie Plame's name from Joe Wilson's entry in "Who's Who in America."

I considered his wife's role in initiating Wilson's mission, later confirmed by the Senate Intelligence Committee, to be a previously undisclosed part of an important news story. I reported it on that basis.