03/28/2008 02:43 am ET Updated May 25, 2011

Alleged Spy Worked Undetected At The White House For Almost Three Years...

Both the FBI and CIA are calling it the first case of espionage in the White House in modern history.

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.

Read more on ABC News