WASHINGTON - April 14, 2008 - The Bush regime said yesterday that it plans to start using the nation's most advanced spy technology for domestic purposes soon, rebuffing challenges by House Democrats over the idea's legal authority.

Homeland Security Secretary Michael Chertoff said his department will activate his department's new domestic satellite surveillance office in stages, starting as soon as possible with traditional scientific and homeland security activities - such as tracking hurricane damage, monitoring climate change and creating terrain maps.

Sophisticated overhead sensor data will be used for law enforcement once privacy and civil rights concerns are resolved, he said. The department has previously said the program will not intercept communications.

"There is no basis to suggest that this process is in any way insufficient to protect the privacy and civil liberties of Americans," Chertoff wrote to Reps. Bennie G. Thompson (D-Miss.) and Jane Harman (D-Calif.), chairmen of the House Homeland Security Committee and its intelligence subcommittee, respectively, in letters released yesterday.

"I think we've fully addressed anybody's concerns," Chertoff added in remarks last week to bloggers. "I think the way is now clear to stand it up and go warm on it."

"I have had a firsthand experience with the trust-me theory of law from this regime," said Harman, citing the 2005 disclosure of the National Security Agency's domestic spying program, which included warrantless eavesdropping on calls and e-mails between people in the United States and overseas. "I won't make the same mistake. . . . I want to see the legal underpinnings for the whole program."