A key lawmaker is raising questions about air travel security after a convicted felon and former member of a domestic terrorist organization was able to use an expedited airport security line.

Congressman Bennie Thompson of Mississippi is the senior Democrat on the House Homeland Security Committee. Thompson says disclosure of the incident last June highlights problems with how TSA identifies passengers for expedited screening lanes.

The Homeland Security Department's Inspector General says the felon was convicted of murder and explosives-related charges but was allowed to pass through the Transportation Security Administration's PreCheck security lane. It's desigcaldned for passengers who are considered a low security risk.