Trump cannot ban assets or things that decentralized and in case you don't know what decentralized means please refer google and have a read about it.

Basically US alone does not run Bitcoins and there are users who hold and trade bitcoins who live in US but that does not mean they control the whole price of bitcoins and a ban by their leaders will crash the market. I agree it would bring the price down by a little bit maybe given the sell orders that would be placed by the US traders in that instance but the drop in price would always be temporary.

I do not understand why people associate everything with bitcoins like if a president is elected people speculate its impact over bitcoins and similarly if someone like Trump got corona people start talking about bitcoin prices.