In the waning months of his tenure, President Bush and his allies are once again trying to scare Congress into expanding the president’s powers to spy on Americans without a court order.

This week, the White House and Democratic and Republican leaders on Capitol Hill hope to announce a “compromise” on a domestic spying bill. If they do, it will be presented as an indispensable tool for protecting the nation’s security that still safeguards our civil liberties. The White House will paint opponents as weak-kneed liberals who do not understand and cannot stand up to the threat of terrorism.

The bill is not a compromise. The final details are being worked out, but all indications are that many of its provisions are both unnecessary and a threat to the Bill of Rights. The White House and the Congressional Republicans who support the bill have two real aims. They want to undermine the power of the courts to review the legality of domestic spying programs. And they want to give a legal shield to the telecommunications companies that broke the law by helping Mr. Bush carry out his warrantless wiretapping operation.

The Foreign Intelligence Surveillance Act, or FISA, requires the government to get a warrant to intercept communications between anyone in this country and anyone outside it. The 1978 law created a special court that has approved all but a handful of the government’s many thousands of warrant requests.