Bush is the President. Under the constitution, Republican presidents are infallible and posses ABSOLUTE POWER.
You really need to crack a history book. Every president has exercised the same power. In fact, the President does have absolute Constitutional authority to declassify information as his judgment - and his judgment alone - sees fit.
FDR released the objective of
Overlord the day of the invasion to provide political support for that operation. The day before that release it was the second most closely-guarded secret that the United States maintained.
Truman released the objective of the
Manhattan Project to provide political support for a Japanese surrender. The day before it was released it was the single most closely-held secret the US maintained.
Ike I cannot think an example for off the top of my head.
Kennedy leaked near real-time imagery of Soviet medium range ballistic missile sites under construction in Cuba to provide political support for his naval blockade strategy during a time that U2 camera capabilities were a very closely guarded secret.
Johnson declassified air strikes in response to the Gulf of Tonkin incident before the packages launched in order to meet the deadline for the morning headlines which were distributed after the strikes had egressed.
Nixon declassified combat camera footage on an almost daily basis for news outlets. I'll have to search for a more specific example.
Ford I cannot think of a specific example for off the top of my head.
Carter released details of
Operation Eagleclaw - the failed attempt to rescue US hostages being held in Iran.
Reagan released SIGINT intercepts against Libya as well as combat camera and impending operations during the air battles over the Gulf of Sidra.
George HW Bush released tons of combat camera from
Desert Storm, the date of the operation and the fact the the US could predict SCUD-III missile launches to buttress political support for that operation.
Clinton revealed through back-channel press outlets the fact that Iraq was cooperating with al Qaeda in the production of VX nerve agent at the al Shifa pharmaceutical plant near Khartoum in the Sudan - including the fact that the CIA had taken covert soil samples near the plant - to silence critics of
Operation Infinite Reach.