Clarity
A bit of clarification on what section of the law was broken by Bush in spying on Americans.US Code, Title 50, Chapter 36, Subchapter I, § 1809
(a) Prohibited activities
A person is guilty of an offense if he intentionally—
(2) discloses or uses information obtained under color of law by electronic surveillance, knowing or having reason to know that the information was obtained through electronic surveillance not authorized by statute.
(b) Defense
It is a defense to a prosecution under subsection (a) of this section that the defendant was a law enforcement or investigative officer engaged in the course of his official duties and the electronic surveillance was authorized by and conducted pursuant to a search warrant or court order of a court of competent jurisdiction.