WASHINGTON -- The National Security Agency, in carrying out President Bush's order to intercept the international phone calls and e-mails of Americans suspected of links to Al Qaeda, has probably been using computers to monitor all other Americans' international communications as well, according to specialists familiar with the workings of the NSA. The Bush administration and the NSA have declined to provide details about the program the president authorized in 2001, but specialists said the agency serves as a vast data collection and sorting operation. It captures reams of data from satellites, fiberoptic lines, and Internet switching stations, and then...