Trump should act deaf to CAs pleas for help. Just don’t respond. Ignore Brown until he crawls (literally) to the WH, begging publicly for forgiveness.
Then, remind Brown that with all the chaos in the streets, massive illegal immigration, an enormous debt, the refugee crisis, with having to fight liberal courts every step of the way, with having to defend himself & his family from disgusting attacks such as those Brown himself have leveled, Trump just has not had the time to properly assess the CA storm damage - he’ll get back to Brown “soon”.
Finally, sympathizing with Brown, Trump should offer him 100k surplus WWII shovels, suggesting Brown mobilize all the unemployed in CA to start shoveling mud.
And Trump should tell Brown he’ll consider the request for assistance if/when he gets a handle on the UC State College system. Tame the animals, the animal trainers (profs), the zookeeper (Janet Napolitano), and permit free speech without threat of violence.