The former congressman who's heading the National Rifle Association's school emergency response program that would include volunteers to help guard children says it makes sense because it's similar to placing air marshals on planes.

Asa Hutchinson tells ABC's "This Week" that the air marshal program has provided a deterrent and made flying safer.

He says putting trained guards such as retired police officers or military persons at schools will help protect students. Hutchinson says hiring guards to defend schools is a "very reasonable approach" but it should be a local choice.

New Jersey Gov. Chris Christie, a prominent Republican, says the approach will turn schools into an armed camp for kids.