Senators say they are concerned that a bicameral dispute over the appropriations bill funding the Department of Homeland Security could derail efforts to avert a government shutdown. 

The House and Senate have until March 22 to pass the final six of the 12 appropriations bills that fund the government and narrowly averted a partial shutdown by passing the first set of six last week. Appropriators are struggling to reach a deal on the six remaining bills, which fund the Pentagon, State Department, Labor Department, Health and Human Services Department, DHS, and foreign operations.