Late-night Threat To Immigration Bill

By a one-vote margin, just after midnight, the Senate adopted a potential deal-killer amendment to the immigration bill. 

The late-night voting spree tested the bipartisan Senate coalition's ability to swat aside so-called killer amendments, at times using procedural maneuvers to block their passage.

But they couldn't thwart adoption of an amendment from Sen. Byron Dorgan (D-S.D.) that would disband the temporary guest worker program after five years. It was unclear how the coalition would proceed.