The Senate on Friday narrowly averted a government shutdown at midnight, passing a G.O.P.-written stopgap spending measure after Senator Chuck Schumer of New York, the minority leader, and a small group of Democrats joined Republicans in allowing it to advance.

A spending bill to avert a partial government shutdown narrowly cleared a key procedural hurdle in the Senate, paving the way for passage as a Friday night deadline loomed. Ten Democrats joined with Republicans to clear the 60-vote threshold needed to advance the measure.