Because the budget isn't being approved.
No budget = no money, no money = no workers.
Essentially this is coming down to two things:
1). Democrats not cutting 'enough' spending.
2). Republicans tacking on unrelated cuts.
The Republicans don't think the Democrats are cutting enough spending, so they want to remove funding for 'Planned Parenthood' which covers abortions for people who want them but cannot afford them.
Republicans argue that THEIR money shouldn't go to things THEY don't agree with, but if that was the case then nothing would be funded sufficiently.
I personally am siding with the Democrats and hope they stand strong, but I know it will hurt a lot of people.
However, this is VERY hypocritical of Republicans since...