I can already hear what he will say. It will echo Casey's remarks about diversity being a strength. He will read off the names of each victim to illustrate how diverse a group the victims were. He was call for caution on reaching any judgments about the motivations of the "alleged" perpetrator. He will say that the vast majority of Muslims are peaceful and do not support such actions.
And you can bet that there will be something related to him personally just like his video celebrating the fall of the Berlin Wall. We can start counting the number of "I" s.