I suspect that Trump is more about changing the terms of trade and carving out a better deal and not so much about lifting the trade drawbridge altogether. With all the hysteria over Trump and tariffs its worth noting that:
“…President George W. Bush imposed tariffs of up to 30% on steel in 2002. They remained in effect for more than a year. And Ronald Reagan restricted imports of steel in 1984, and later imposed a 100% tariff on some Japanese electronic products. Somehow the republic survived.