Officials tell ABC News the alleged spy worked undetected at the White House for almost three years. Leandro Aragoncillo, 46, was a U.S. Marine most recently assigned to the staff of Vice President Dick Cheney.

"I don't know of a case where the vetting broke down before and resulted in a spy being in the White House," said Richard Clarke, a former White House advisor who is now an ABC News consultant.

Federal investigators say Aragoncillo, a naturalized citizen from the Philippines, used his top secret clearance to steal classified intelligence documents from White House computers.

When Aragoncillo is asked what he was spying on, he will say he was merely passing on information gathered by the CIA and the FBI on Gloria. To whom, well, I'm just aching to find out. Any wild guesses?

Still, judging by what the CIA knew about Saddam Hussein, they probably don't have jack on GMA.

Read here.