As usual the human spaceflight directorate ( Space Operations Mission Directorate (SOMD) at NASA) is up to its old tricks, stealing money from science missions to fuel their super-pork, super-pointless manned missions. NASA has a long history of doing this all the way back to the late 70's. It is why Carl Sagan, Bruce Murray, and Louis Friedman formed the Planetary Society.
At one point, NASA spent more on a new space toilet (made in Russia no less) for the ISS (about 30 mil) than for the Europa mission (about 5 mil). This foot dragging and poaching went on for years before the Planetary Soc. put NASA's feet to the fire. But the SOMD is up to it again; wasting billion on some asinine Moon pipe dream that could be done with robots for a fraction of cost.