The political situation of a country does not affect crypto prices, of course. But political decisions can affect bitcoin prices because positive or negative government regulations make investors think hard for investment.
If Trump decides suddenly the cryptos/crypto activities are banned in the USA, be sure it will affect the price (a result of a political decision) So yes, political decisions can affect the price. But a political situation can too make the Bitcoin value increasing/decreasing. If you take a look back at the Venezuela and Greece crisis, the Bitcoin value was increasing during this both period of time