The head of the Central Intelligence Agency, Porter Goss, has resigned.
Announcing the move on Friday, President Bush thanked the spy chief for running the agency during a period of transition. The president did not name a successor.
Goss held the top CIA job for the past two years. The position was somewhat diminished last year, when it came under the supervision of the newly-created post of Director of National Intelligence.
Goss replaced George Tenet, who took criticism for the CIA's failure to foil the September 2001 terror attacks and for faulty pre-war intelligence concerning Iraq.
While Goss did not appear to have Tenet's political liability, there was little public evidence during his tenure that intelligence forces were closer to capturing al-Qaida leader Osama bin Laden. Goss was also criticized for bringing his political allies to what is supposed to be a politically neutral agency.
The resignation comes amid speculation that President Bush would announce several changes in the administration as the nation prepares for mid-term elections.
White House spokesman Scott McClellan is set to leave his job, to be replaced by former conservative television news commentator, Tony Snow.
Mr. Bush today praised Goss for bringing what he called a sense of professionalism to the agency and helping integrate the CIA with other intelligence agencies. The president said he was confident that Goss's unnamed successor would continue the former director's plan of bringing in more analysts and operatives to the agency.