The White House said Obama's speech coincides with the signing of new "presidential policy guidance" on when the U.S. can use drone strikes, though it was unclear what that guidance entailed and whether Obama would outline its specifics in his remarks.
Chief among the topics the speech will focus on, officials said, is the administration's expanded use of unmanned spy drones to kill hundreds of people in Pakistan, Yemen and other places where terrorists have taken refuge.
Obama has pledged to be more open with the public about the scope of the drone strikes. But a growing number of lawmakers in Congress are seeking to limit U.S. authorities that support the deadly drone strikes, which have targeted a wider range of threats than initially anticipated.
The president is expected to talk generally about the need for greater transparency in the drone strikes and may allude to the desire to give greater responsibility for those operations to the military. But he is likely to tread carefully on an issue that involves classified CIA operations.
The U.S. military has begun to take over the bulk of the strikes, replacing the CIA in nearly all areas except Pakistan, according to an administration official who was not authorized to discuss the plans on the record and spoke on condition of anonymity. That shift in responsibility has given Congress greater oversight of the secretive program.
Obama "believes that we need to be as transparent about a matter like this as we can, understanding that there are national security implications to this issue and to the broader issues involved in counterterrorism policy," White House spokesman Jay Carney told reporters Wednesday.
"He thinks (this) is an absolutely valid and legitimate and important area of discussion and debate and conversation, and that it is his belief that there need to be structures in place that remain in place for successive administrations," Carney said. "So that in the carrying out of counterterrorism policy, procedures are followed that allow it to be conducted in a way that ensures that we're keeping with our traditions and our laws."