Domestic snooping

I'm confused. As everyone knows by now, Bush has now admitted that he signed off on "a secret order in 2002 allowing the NSA to eavesdrop on Americans and others in the United States who are communicating with people overseas." On the whole, tis isn't a bad thing-- our government should keep an eye out on people engaging in questionable activities which can threaten the security of the country.

But as already noted by the people over at TPM, there's already a secret court which grants warrents to do just this very thing. And the argument that speed was an issue doesn't hold up, as the court
specifically empowers the Attorney General or his designee to start wiretapping on an emergency basis even without a warrant so long as a retroactive application is made for one "as soon as practicable, but not more than 72 hours after the Attorney General authorizes such surveillance."
So why is Bush doing this? Something isn't right, and my guess is that it's only a matter of time before the rest of the story comes to light...