"Spies, Lies and Wiretap," a NYT editorial worth reading:
... Mr. Bush made himself the judge of the proper balance between national security and Americans' rights, between the law and presidential power. He wants Americans to accept, on faith, that he is doing it right. But even if the United States had a government based on the good character of elected officials rather than law, Mr. Bush would not have earned that kind of trust. The domestic spying program is part of a well-established pattern: when Mr. Bush doesn't like the rules, he just changes them, as he has done for the detention and treatment of prisoners and has threatened to do in other areas, like the confirmation of his judicial nominees. He has consistently shown a lack of regard for privacy, civil liberties and judicial due process in claiming his sweeping powers. The founders of our country created the system of checks and balances to avert just this sort of imperial arrogance. [...]
War changes everything. Mr. Bush says Congress gave him the authority to do anything he wanted when it authorized the invasion of Afghanistan. There is simply nothing in the record to support this ridiculous argument.
The administration also says that the vote was the start of a war against terrorism and that the spying operation is what Mr. Cheney calls a "wartime measure." That just doesn't hold up. The Constitution does suggest expanded presidential powers in a time of war. But the men who wrote it had in mind wars with a beginning and an end. The war Mr. Bush and Mr. Cheney keep trying to sell to Americans goes on forever and excuses everything. [...]
Like Mr. Nixon, Mr. Bush is waging an unpopular war, and his administration has abused its powers against antiwar groups and even those that are just anti-Republican.