Story highlights House Republicans are piling up their agenda onto a must-pass spending bill

GOP members gathered to discuss their options Wednesday afternoon

Washington (CNN) Republicans on Capitol Hill promise they won't shut down the government on December 22 when funding lapses, but how will they pull it off with just a handful of legislative days? Nobody can explain that.

House Republicans unveiled another short-term spending bill Wednesday night to get the government to January 19, but many of the provisions likely won't pass muster in the US Senate.

Frustrated that the Senate hasn't moved on spending bills this year, House Republicans are piling up their agenda onto the must-pass bill, putting Republican leadership in a tough spot between two distinctive poles: the wishes of their right flank and the politics of the US Senate.

Republicans in the House unveiled a stop-gap funding bill Wednesday night that increased defense spending and funded defense for the year while maintaining the same level of domestic spending through a temporary spending bill. They also included their own re-authorization of the Children's Health Insurance program . But, multiple House Republicans acknowledged earlier in the day that this version of the legislation was going nowhere in the Senate, where eight Democrats would be needed to support any measure under Senate rules.

House Republican gathered to discuss their options Wednesday afternoon in a 90-minute meeting that one person in the room described as an opportunity for leadership to "open up the playbook."

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