"First, the CIA would perform an internal investigation. The results of that would be passed on to the Justice Department for professional investigation. I don't think this will be dropped. "At the end of the day, it's of keen interest to me to see whether or not we can get Karl Rove frog-marched out of the White House in handcuffs. And trust me, when I use that name, I measure my words."
Now, I understand that he later backtracked somewhat to imply it may've been someone other than Rove, though I'm unclear as to whom. But, that's where the Rove connection arises.