WASHINGTON - The U.S. foiled a plot to bomb the New York Stock Exchange because of the sweeping surveillance programs at the heart of a debate over national security and personal privacy, officials said Tuesday at a rare open hearing on intelligence led by lawmakers sympathetic to the spying.

The House Intelligence Committee hearing provided a venue for officials to defend the once-secret programs and did little probing of claims that the collection of people's phone records and Internet usage has disrupted dozens of terrorist plots.

Few details were volunteered.