
** FILE ** Transportation Security Administration chief John S. Pistole. (Associated Press)

Homeland Security Secretary Janet A. Napolitano, accompanied by Transportation Security Administration Administrator John Pistole, announces the expansion of a passenger pre-screening initiative on Wednesday.

Homeland Security Secretary Janet Napolitano, accompanied by Transportation Security Administration chief John Pistole, announces the expansion of a passenger pre-screening initiative on Feb. 8, 2012, at Washington's Ronald Reagan National Airport. (Associated Press)

** FILE ** Transportation Security Administration chief John S. Pistole. (Associated Press)

John Pistole

John Pistole

Transportation Security Administration chief John S. Pistole on Thursday welcomed the unionization of his agency's 47,000 airport screeners. The move has proved controversial, with critics arguing that, as a security agency, TSA should not allow collective bargaining. (Associated Press)

"We need to be smarter in how we go about doing things. We need to use more common sense." - John Pistole, administrator of the TSA. (Associated Press)

Transportation Security Administration Administrator John S. Pistole testifies on Capitol Hill in Washington on Wednesday, June 22, 2011, before a Senate Homeland Security and Governmental Affairs Committee hearing examining ongoing transportation security threats. (AP Photo/Jacquelyn Martin)