Doubt Ari because he testified much earlier. He would have given the info on Woodward then I would think. Did Powell testify earlier? What about Louie Freeh?
My bet is Powell, Armitage, or Wilkerson at State. I am sure that once the Pincus and Kristof articles came out, the search was on for the name of this mysterious former US ambassador who had visited Africa on behalf of the CIA.