AP: Major U.S. Defense Shakeup Coming This Week

WASHINGTON (AP) -- Administration sources say President Barack Obama plans this week to name CIA Director Leon Panetta to replace Defense Secretary Robert Gates, and Gen. David Petraeus, now running the war in Afghanistan, would take the CIA chief's job.

The officials all spoke on condition of anonymity because the changes are not final.

The changes would probably take effect this summer. Gates has already said he will leave this year.

The officials say Obama is expected to also announce that Lt. Gen. John Allen would replace Petraeus as Afghanistan commander, and that diplomat Ryan Crocker will be the next U.S. ambassador in Afghanistan.

The changes are expected to be announced Thursday at the White House.