Besides, it is not like that Trump has all the cards in his hands. It is not like that bitcoin comes under anyones control. That is why it is said to be decentralized in nature. Even if America decides to ban bitcoin, like China did once, this digital currency will be supported by big investors. Moreover, companies like Microsoft which are USA based, are already supporting bitcoin.
If there is a ban from major economic nations then there will be a twist for the worst as no one will be investing in it, for investors they would not invest in these markets if they stand in the opposite side of the law, but the problem with it is that the market has grown and there is nothing anyone can do right now and hence they will come up with regulations and i am not sure about the position of Trump regarding the entire market.