I am linking a CNBC article which fills in the context of what Trumo said albeit in a rather clumsy manner.
http://www.cnbc.com/2016/05/28/trump-tells-california-there-is-no-drought.html
His point, which has been well documented by the media for at least a year is that water is being diverted to protect some little fish while farmers have had their irrigation water shut off. More totally stupid Barry rules!
Do you REALLY believe CA does not have a drought?