U.S. Sen. Johnny Isakson (R-Ga.) is asking the Transportation Security Administration to investigate an alleged security breach at Hartsfield-Jackson Atlanta International Airport.

Isakson made the request in a letter to TSA Director John Pistole. It came in response to a recent investigative report by WSB-TV exposing a potential security gap in the airport's catering operation.

The story focused on the operations of Gate Gourmet, and concerns about security both with catering and with employees "piggybacking" through checkpoints where they are required to swipe their identification cards.

Isakson serves on the U.S. Senate Commerce Committee's Subcommittee on Aviation Operations, Safety and Security.

Tags: Johnny Isakson, airport security, Transportation Security Administration, TSA, Atlanta Hartsfield-Jackson International Airport