Trump has promised not to sell any Bitcoin in US custody. Rather, it will be a strategic reserve currency.
You should never believe anyone to be honest. The chances are they will do opposite of something they said before elections are much higher. I somewhat believe that trump will hold them but still, he doesn't own them. US Govt does. He is just there to serve to the people of America. I am not sure how much control he has on it even if hes elected as a President.
I don't believe anything politicians say because they are not trustworthy. But there will be two possible outcomes of Trump's promises about Bitcoin. He might fulfil or abandon them. We have to wait to see what happens if he eventually wins. A president has some level of influence over diverse sectors of the country, he can implement some policies if he decides.