WASHINGTON (AP) -- Attorney General Alberto Gonzales said Tuesday that President Bush personally blocked Justice Department lawyers from pursuing an internal probe of the warrantless eavesdropping program that monitors Americans' international calls and e-mails when terrorism is suspected.

The department's Office of Professional Responsibility announced earlier this year it could not pursue an investigation into the role of Justice lawyers in crafting the program, under which the National Security Agency intercepts some telephone calls and e-mail without court approval.

At the time, the office said it could not obtain security clearance to examine the classified program.

Under sharp questioning from Senate Judiciary Committee chairman Arlen Specter, Gonzales said that Bush would not grant the access needed to allow the probe to move forward.