Sure, but if I was a betting man, I'd say there's a good 95% chance they get paid. It's bad politics to do otherwise.
I'm not saying they'll do it because the law says so. Just that there's a lot of reasons not doing it only hurts them with no real benefits.
The people working are guaranteed pay by labor law. No one is debating not paying the people actually working.
Any talk of not paying people is about those government employees who are currently furloughed.