I don’t know why this is so difficult. Just change the Senate Rules (again) and apply the Reid Rule to fiscal bills. No filibuster and Obama will be the one shutting down Homeland Security when he vetoes the bill.
“I don’t know why this is so difficult.”
You’re assuming the GOP wants to stop DHS’ funding and stop Obama’s amnesty. They don’t. So the difficulty is that fewer than 5 (probably 0) people in the senate want to stop Obama. Nothing that happens in Senate/house makes any sense until you realize that 95% of them are on board and the rest are either too weak to do anything or too stupid to see it.