Officials say they may renegotiate payments to computer services company because multibillion-dollar project is unexpectedly complex.
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Federal officials defend efforts taken since the Sept. 11 terrorist attacks.
Says implementation is moving too slowly, but reiterates commitment to making the program work.
Funding shortfalls are preventing immigration officials in at least one region from detaining aliens.
Chief acquisition officer named as agency aims to tighten procedures after probe.
An amendment urging the adoption of a bill calling for better coordination among the nation's 15 intelligence agencies, was struck down, Democrats said.