WASHINGTON, Jan. 1 - President Bush continued on Sunday to defend both the legality and the necessity of the National Security Agency's domestic eavesdropping program, and he denied that he misled the public last year when he insisted that any government wiretap required a court order. "I think most Americans understand the need to find out what the enemy's thinking, and that's what we're doing," Mr. Bush told reporters in San Antonio as he visited wounded soldiers at the Brooke Army Medical Center. "They attacked us before, they'll attack us again if they can," he said. "And we're going to...