All currencies are based on trust, and trust is give by different factors. In the case of US, it is given by world coverage. Custom Tariffs may reduce the interational transactions, reducing also the usage of USD. This means that it may affect the value against other currencies, including gold and BTC. We´ve already faced Eras of protectionism in the last 2 centuries, but never, with a global currency like BTC that is the thermometer of the situation. This is a new scenario for BTC.