The December 11, 2026, expiration of the current continuing resolution creates the immediate pressure point for federal funding negotiations during the lame-duck session. With Republicans retaining control until January, lawmakers face limited session days to either complete full-year appropriations or pass another stopgap measure before a lapse begins December 12. Partisan differences center on overall spending levels, supplemental defense funding, and potential policy riders tied to the ongoing conflict with Iran, while Democrats weigh using the deadline to influence administration priorities. Historical patterns show both parties often favor extensions to avoid disruptions near the holidays, though unresolved disputes over the dozen appropriations bills could still elevate shutdown risk if agreement proves elusive before the new Congress convenes.