It's part of an orchestrated campaign against Cheney. Also, it might be a cover up operation. Jan Kavan, the Czech foreign minister at the time, suggested that american intelligence was informed of the meeting before 9/11 and the Americans might fear the information because they failed to act (though even the czechs might not have know it was Atta until after his pic was broadcat post-9/11.)
This will be fodder for the Anti-Cheney faction in our services. Cheney's hope might rest in a complete discussion of all the events, or the Czechs speaking up again.
Cheney himself was 50-50 skeptical, but that's rarely reported.
Tenet let Bush twist in the wind on the "16 words" and Niger, when as we know now the whole thing was a fake controversy. What would it have cost Tenet to speak up in the middle of that, to support the president when we now know that Bush understated the truth by an order of magnitude?
What Tenet did in remaining silent was to expose himself as politically compromised. Dishonest. Small.