During the presidency of George W. Bush, the White House has made an unprecedented reach for power. It has systematically attempted to defy, control, or threaten the institutions that could challenge it: Congress, the courts, and the press. It has attempted to upset the balance of power among the three branches of government provided for in the Constitution; but its most aggressive and consistent assaults have been against the legislative branch:
Bush has time and again said that he feels free to carry out a law as he sees fit, not as Congress wrote it. Through secrecy and contemptuous treatment of Congress, the Bush White House has made the executive branch less accountable than at any time in modern American history. And because of the complaisance of Congress, it has largely succeeded in its efforts.
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The President's recent political weakness hasn't caused the White House to back away from its claims of extraordinary presidential power. The Republican lobbyist Vin Weber says, "I think they're keenly aware of the fact that they're politically weakened, but that's not the same thing as the institution of the presidency being damaged." People with very disparate political views, such as Grover Norquist and Dianne Feinstein, worry about the long-term implications of Bush's power grab.
Norquist said, "These are all the powers that you don't want Hillary Clinton to have." Feinstein says, "I think it's very dangerous because other presidents will come along and this sets a precedent for them." Therefore, she says, "it's very important that Congress grapple with and make decisions about what our policies should be on torture, rendition, detainees, and wiretapping lest Bush's claimed right to set the policies, or his policies themselves, become a precedent for future presidents."
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http://www.nybooks.com/articles/19092