WASHINGTON, Nov. 17 - A tentative deal to extend the government's antiterrorism powers under the law known as the USA Patriot Act appeared in some jeopardy Thursday, as Senate Democrats threatened to mount a filibuster in an effort to block the legislation. "This is worth the fight," Senator Russell D. Feingold, a Wisconsin Democrat who serves on the Judiciary Committee, said in an interview. "I've cleared my schedule right up to Thanksgiving," Mr. Feingold said, adding that he was making plans to read aloud from the Bill of Rights as part of a filibuster if necessary. The political maneuvering came...
