When Alberto Gonzalez, or any other of his majesty's loyal subjects says:
The program is triggered only when a career professional at the NSA has reasonable grounds to believe....
Tell them:
J. Edgar Hoover was a career professional.
Then tell them how he engaged in domestic surveillance in order to blackmail Americans. Tell them how thick Martin Luther King's FBI file is. Tell them about COINTELPRO, and them how they're spying on the Quakers today. It's a perfect opportunity to explain the massive anti-democracy abuses that occurred before FISA, and before we forbade intelligence agencies to operate domestically.