I'm tired of everyone complaining about this new scandal. The sensationalist media is giving the public the idea that the government knew or should have known about the terrorist attacks in advance, and did nothing to stop them.
The bottom line is that there was no specific threat that the government could have acted on.
I'm not saying our president isn't stupid. He's an idiot. But I don't blame him for not being psychic, and no congressional investigation is going to change the past.