It’s achieving an apparent miracle:

If these warnings, and others coming out of the Obama administration, are to be believed, NASA has pulled off an impressive, if not impossible, feat. But on the other hand, are we really to believe it is the only agency capable of doing so?

I’m going to be supremely cynical here, and suggest that Bolden isn’t being pressured to do this as other agency heads are, because no one cares whether or not NASA shuts down. It doesn’t cause any political pain, as some of the other measures (e.g., TSA reductions) will, so he’s being left alone to manage as best he can.