Press conference now: FEMA Director stressed the National Guard called up is under Title 32 (State control). FEMA is funding the call-up.
link?
Here is a copy of the press conference. I can confirm this was mentioned during the press conference. However, as I understand it, it is only for certain states. And the governors are in control of their respective National Guard units. Also, it was mentioned that the partial fees that a state pays for the National Guard is being waved and the federal government will fund them in full.
https://www.youtube.com/watch?v=czQseUdFX0Q