No offense but Trump statement is not that credible nowadays. He might change his mind like what his other statements against anything. When he realized that he is wrong, he will make a way to contradict his first statement so that he will look good and great.
He is a highly fluctuative man, his opinion changes so fast. However, what Trump said is not new at all. We all know how the USA government have tried to control crypto currencies (exchanges, ICOs, IEOS, and so on) in their nation. What Trump said is just boring repeat on what the USA governements have implemented for so long. He did not say anything new, and there is no breaking news from his statements.