Members reject GOP alternative calling for $279 billion in spending cuts over five years and a freeze in nondefense discretionary spending.
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Corps would be made up of 250 active-duty personnel and 2,000 standby personnel, with most employees coming from the State Department and USAID.
Retirement surge and empty pipeline fears mostly are unfounded.
Several House members say the move, prompted by projected budget reductions, is premature.
Move comes weeks after department announced its intentions to move ahead with portions of the new system.
Lurita Doan tells lawmakers she can't remember details of Jan. 26 meeting at a GSA facility during which political issues were discussed.
The 38-year-old program suffered massive losses in the aftermath of hurricanes Katrina and Rita.
Union hopes to expand representation of TSA employees, as rival labor organization notes it has been active in the agency for five years.
Key GOP panel member says allegations against Lurita Doan will not stand up to scrutiny.
Late changes in the law and other factors conspired to place this season among the most difficult in memory, commissioner says.