Nixon created the "imperial presidency." After the public rejected that concentration of power, in the aftermath of Watergate, Reagan restored the imperial presidency in another guise. Now, Bush and Cheney have created the post-imperial presidency. Using the threat of terrorism as their justification, Bush and Cheney have embraced the so-called "unitary executive theory" - which, in truth, is merely another term for an authoritarian presidency.
I have been saying the same thing for a quite a while.