BTC is truly volatile and once you are holding BTC, there is a risk of it either rising or falling, so if Trump goes on with his plan, the U.S. will be exposed to the risks of BTC.
However, if they hold BTC as a strategic reserve and the price rises and generates revenue for the government, then it is a good thing, but if the price falls, people will have bad things to say about the move. One thing people must understand is that strategic reserves are not sold quickly, the state is going to hold it for a very long time or until they see the need to use it.