Michael Chertoff says threat analysis should drive the department's organization and policies, not the other way around.
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NNSA report found that Sandia National Laboratories played down the public's risk from its nuclear reactors.
Europe's plan to resume selling arms to China already has generated the beginning of a backlash in Congress.
Nearly 9,500 gay service members have been discharged from the military under the policy.
In final speech, Homeland Security undersecretary Asa Hutchinson says Minuteman Project to monitor border activity is risky.
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.