WASHINGTON — Republican leaders in the House and Senate said Wednesday that they will reject Democratic demands for an immediate extension of health care subsidies, challenging Democrats to vote against a stopgap spending bill that doesn't include them but will keep the government open at the end of the month.

Senate Majority Leader John Thune, R-S.D., said Democrats “have a choice to make” as the Sept. 30 deadline approaches. They can work with Republicans, Thune said, or “they can shut down the government with all that will mean for the American people.”

The House could vote as soon as Thursday on a Republican stopgap measure to keep federal agencies funded through Nov. 21, buying lawmakers more time to work out their differences on spending levels. Republicans argue they are providing

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