I haven't seen any signs of empathy from trump since he started running for president. I doubt we'll see it now. Not believably, anyway.
He'll have some promises of help, but the response to that will be along the partisan lines trump has already built around himself - those who like trump will believe him  and those who dislike him will ignore him.  If he can find a good script writer and he reads from that script, it won't help - he'll blow it all up with a tweet the next day.
It's far too late for trump to persuade anybody that he can or will follow thru on his promises.
Luckily there seem to be good and experienced FEMA people around. As long as they ignore any of trump's 'thoughts', they'll do as well as anybody can.