Just based on the words that Trump actually says and writes, I find it difficult to come to any conclusion other than Trump strongly believes that trade imbalances are unfair, that tariffs will reshore manufacturing, and that reshoring manufacturing will make America “wealthier.”
But if Trump is bluffing, it’s not clear there’s anything these other countries could give that would satisfy Trump. Vietnam could remove all tariffs against the US and in all likelihood not even make a dent in their trade surplus. It’s very hard for a small, developing country like Vietnam to import lots of stuff from a rich, expensive country like the US. Many of the countries whacked with massive tariffs by the administration already have very open trade policies with the US. What is there to negotiate?