DEFENSE - ALL ARTICLES
Agency officials say overhaul is part of an effort to comply with a presidential directive on protecting critical infrastructure.
TSA officials have not yet determined whether commercial data will be used to screen passengers.
Rail operator CSX and Transportation Department trying to have ban lifted.
Proposals to loosen immigration requirements could slow action on the legislation.
In wake of scandal at Defense Department, new working group aims to combat abuses in acquisition system.
Agencies must submit plans for incorporating new standards by June and comply by October.
But members of information-sharing councils cite worsening relations between industry and Homeland Security Department.