Trump does not want to be trading partners that he thinks are treating the US uinfair.
Other countries are feeling the US is not treating them fair. Of course the majority of trade will not go away but some will. As they have more trade with China, they will have more political ties.
They would prefer the US but they are looking for trading partners they can depend on.
It used to be China-bully, Russia -bully, the USA and the western alliance were close allies on everything.
Now.
China-bully, Russia -bully, the USA - bully