You can read a PDF of his letter about Fast and Furious here.
Frederick R. Hill, spokesman for the House Oversight and Government Reform Committee, responds:
If Attorney General Holder had said these things five months ago when Congress asked him about Operation Fast and Furious, it might have been more believable. At this point, however, it’s hard to take at face value a defense that is factually questionable, entirely self-serving, and a still incomplete account of what senior Justice Department officials knew about gun walking.