Auditors find that multiple departments share responsibility for key initiatives, raising questions about overall coordination.
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Eight additional Air Force deals worth about $3 billion will be scrutinized.
If Senate followed House plan, Kay Bailey Hutchison, R-Texas, would end up losing her subcommittee chairmanship.
DHS still allowed to assign risk levels to passengers and prevent them from boarding planes while system is being tested.
Sen. George Voinovich, R-Ohio, wants to see the results of efforts at Homeland Security and Defense before taking reform governmentwide.
Holdup over contentious FBI memo and debate on class-action overhaul measure pushes back Senate vote until next week.
First installment will come as part of Bush administration's fiscal 2005 supplemental spending request to be delivered to lawmakers next week.
Several officials tell Senate subcommittee that extensive training is needed if overhaul of system is to succeed.