Secretary Ridge, a former governor of Pennsylvania, was the first person to head the new Homeland Security department. Above, Ridge in a file photo from March 18, 2003.
Calling the move "a difficult decision," U.S. Homeland Security Secretary Tom Ridge announces his resignation from the Bush administration. Ridge made a formal announcement in a news conference Tuesday afternoon. Ridge has served in the position since the department's creation in 2003. Hear NPR's Korva Coleman.