The Bush administration, which has been pushing presidential power to new extremes, is reportedly developing an even more dangerous new theory of executive privilege. It says that if Congress holds White House officials in contempt for withholding important evidence in the United States attorney scandal, the Justice Department simply will not pursue the charges. This stance tears at the fabric of the Constitution and upends the rule of law.

Congress has a constitutional right to investigate the purge of nine United States attorneys last year. And there is no doubt that the investigation has unearthed improprieties: several administration officials have already admitted illegal or improper actions involving the politicization of the country’s chief law enforcement agency.

But the administration has been extraordinarily defiant toward Congress’s legitimate requests for information. The low point came recently when Harriet Miers, the former White House counsel, refused even to show up in response to a Congressional subpoena. Some of the questions she would have been asked might have been protected by executive privilege, but others no doubt would not have been. Ms. Miers had no right to ignore the entire proceeding.

The next question is how Congress will enforce its right to obtain information, and it is on that point that the administration is said to have made its latest disturbing claim. If Congress holds White House officials in contempt, the next step should be that the United States attorney for the District of Columbia brings the matter to a grand jury. But according to a Washington Post report, the administration is saying that its claim of executive privilege means that the United States attorney would be ordered not to go forward with the case.