As expected for months, Trump late yesterday nominated Congressman James Bridenstine (R-Oklahoma) as the new administrator of NASA.
He will still have to be confirmed by the Senate. Interestingly, both Florida senators, a Democrat and a Republican, have announced their opposition to the nomination.
Bridenstine is somewhat in favor of private space, but previous analysis of his past proposals by myself and others has not been encouraging. What he will do as head of NASA however remains unknown. Based on his past statements, I would be surprised if he cut back on either commercial space or SLS.