U.S. senators were headed back to the Capitol for another vote on government funding on the third day of a partial shutdown, but there has been no sign of any real progress toward ending their standoff.

Although Republicans control the White House and both chambers of Congress, the Senate's filibuster rules make it necessary for the government funding legislation to gain support from at least 60 of the 100 senators. That's given Democrats a rare opportunity to use their 47 Senate seats to hold out in exchange for policy concessions.

Democrats have demanded that a set of expiring health insurance tax credits be extended before they sign on to any deal. Republicans, who need several Democratic votes in the Senate, said those negotiations should wait until after the funding measure passes.

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