The longest government shutdown in American history appeared headed on Monday to an eventual resolution, after several Democratic senators broke ranks to join Republicans in advancing a compromise deal -- and sparking intra-party backlash.

Since October 1, the first day of the shutdown, more than a million federal workers have been unpaid, while government benefits and services have been increasingly disrupted.

Severe impacts on air traffic have begun to mount in recent days, with hundreds of flights canceled daily, raising the political pressure to end the stalemate.

After clearing a key procedural hurdle late Sunday, the Senate was expected to pass the compromise budget late Monday or even overnight.

The bill will then move to the Republican-controlled House of Representatives, which

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