Inside the Bush Administration's decision-making on how to respond to the airline bomb threat White House officials had been tracking the British terror plot for weeks, supplying advice and intelligence to both Prime Minister Tony Blair's government and to Pakistan, where suspects have also been arrested. But it was not until Aug. 1 or 2, administration officials said, that investigators discovered U.S. travelers were the target. President George W. Bush's daily intelligence briefings immediately became longer, and came to include more participants. "The President was very, very clear about his priorities," one aide recalled, adding that those included assistance to...