Presidential War Powers
The grant of power in the Constitution to the president is large, but the power of the office is hardly unlimited, even in time of war. Remember the founders were pretty familiar with Classical political history and could have drawn on it to provide a constitutional mechanism for declaring a dictatorship. They did not do so. The only logical conclusion is that they assumed that the constitutional order would remain fundamentally unchanged in time of war or other emergencies.
OK, that point is important. The grant of powers to the president is not unlimited, either in war or peace. But it does not answer where those powers do stop. Here we do step into shades of gray, but it is not a fog.
In the world of the founders, the president might have to react to events long before a congress could be convened. It is reasonable to assume, as Lincoln did, that the president did have a broad grant of military powers to respond rapidly and in accordance to the challenge faced.
Much of what Lincoln did remains controversial--in particular the suspension of habeas corpus--a power specifically granted to Congress in the constitution. However, if my memory serves, the Congress"legitimized" his use of that power and his other actions after it convened.
This, I think, was what the founders intended. The president should have broad powers indeed, but those powers were to be used in consultation with Congress as soon as possible. Put slightly differently, if Lincoln was right, those powers were intended to protect the nation until the constitutional order could catch up.
In the wiretapping controversy, Bush began the action immediately after 9/11, an emergency situation. He did consult with a few members of Congress at the time. To that point, I think he is within his powers, despite a law on the books that denied the president that power.
However, it is becoming clearer and clearer that instead of working with Congress to provide a constitutional framework for his action, he kept even the chose few in the dark about the expansion of the program.
Here, he clearly crossed the line into illegality. He did so because there was no longer a necessity for rapid and super-secret action. In the context of other actions and considering Bush and Cheney's aim prior to 9/11 to strengthen the president’s ability to act unilaterally, I can only conclude that he is using 9/11 to expand the powers of the president as far as he can push them.
This power grab does pose long-term dangers for the nation. It also has harmed our cause. The administration's defense of torture has damages us badly in terms of propaganda and it has demeaned us morally. The desire to have unchecked power to detain America citizens has forced even conservative jurists to try to impose limits. The same is true with message interception. If the problem really had been the nature of the subpoena system under existing law, he had plenty of time to negotiate a new oversight regime with a friendly Congress. His choice not to do so was a bad one.
All of these--particularly the first two--have reduced the trust that Americans have for him. This weakens him, and it weakens our ability to wage war. And it weakens our democratic republic.