According to the CNN article there was no reason not share the information since Atta was not a citizen but someone here on visa.
Quote:If the team did identify Atta and the others, it's unclear why the information wasn't forwarded. The prohibition against sharing intelligence on "U.S. persons" should not have applied since they were in the country on visas and did not have permanent resident status.
But one thing I am curious about is that even if this was one of Clinton supposed goof ups, wouldn't Bush be just as responsible after he took he over?