Washington, D.C. ? The fate of $600-$1,200 rebate checks for more than 100 million Americans is in limbo after Senate Republicans blocked a bid by Democrats to add $44 billion in help for the elderly, disabled veterans, the unemployed and businesses to the House-passed economic aid package.

GOP senators banded together Wednesday to thwart the $205 billion plan, leaving Democrats with a difficult choice either to quickly accept a House bill they have said is inadequate or risk being blamed for delaying a measure designed as a swift shot in the arm for the lagging economy.

The tally was 58-41 to end debate on the Senate measure, just short of the 60 votes Democrats would have needed to scale procedural hurdles and move the bill to a final vote. In a suspenseful showdown vote that capped days of partisan infighting and procedural jockeying, eight Republicans – four of them up for re-election this year – joined Democrats to back the plan, bucking GOP leaders and President Bush, who objected to the costly add-ons.