Bush broke the law and went against the Constitution by telling the National Security Agency to tap American citizens' phones without warrants from judges. The rights assured Americans are quite clear:

The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.