Should do what europe is doing right now especially germany.
Ban flights from uk, sa and brazil. Close down regions that have extra high contagion (california for example)
Also, approve chinese kn95 masks for medical use. Also encourage citizens to use these kn95 along w the european versions (n95 should still be r3served for drs)
Start preparing for uk strain e, build temporary hospitals like chinese are doing.
There are tons of thing he can do.
Saying theres nothing he can do is not only pathetic but means he wont do