The Senate is moving forward on legislation to fund the Homeland Security Department, but the House is in limbo two days away from a partial agency shutdown as conservatives angrily reject the Senate plan.

Many House Republicans say they aren't ready to admit defeat and approve spending for the department without demanding concessions from President Barack Obama on immigration. They are pressuring House Speaker John Boehner to hold firm against that approach, even as Senate Majority Leader Mitch McConnell argues that it's the best way out of the GOP's dilemma.

No other options are apparent, aside from a partial shutdown of the agency charged with protecting the U.S. against terrorism. Without congressional action, that will happen at midnight Friday — and polls show Republicans likely to take the political blame.