[Restorer]

I think you are forgetting that Bush did not decide to invade Iraq on his own authority. He went to Congress and got its authorization, as the Constitution called for him to do.

I also find it difficult to imagine that any American would expect the President to allow a nuke to be detonated in America because it wouldn't be sporting to strike first.

[nosofar]

I think you are forgetting that Bush did not decide to invade Iraq on his own authority. He went to Congress and got its authorization, as the Constitution called for him to do.

That's one of the primary checks. Perhaps Lincoln was referring to instances where the President did not get this authorization.

I also find it difficult to imagine that any American would expect the President to allow a nuke to be detonated in America because it wouldn't be sporting to strike first.

There is no difference from a nuke detonated by a terrorist or an army invading from outside. They are both attacks against the nation. I don't think any distinction needs to be made as to whether to do something about it or not as far as Lincoln's statement is concerned.