If protectionism will cause a severe economic crisis, the prices of cryptocurrencies might experience some increase, as people would be using them as a hedge against their crumbling national economy. But is not as simple as "Trump announced new tariffs - Bitcoin to the moon", it would have to take a long time to notice this effect, and some other effects like the usual volatility and market cycles can easily dwarf any boosts gained from protectionism.
Trump is an idiot who is recruited by Putin. All his statements are aimed at the destruction of the world order. It seems to me that all this will end with impeachment but the consequences of trump's destructive actions in the world economy will be felt for a long time. But I'm sure it'll only be about Fiat. Crypto-economy will remain on the sidelines.