There will come a point were countries are forced to choose between China and the US. The choice may shock some Americans lol.
Even the US picks China for most of their goods.
Trump will send the US Navy to intercept all cargo ships demanding his 20%. A defensive action to protect the US economy and US national security. (and increase Trump family wealth for the beautiful job)
That's what the entire apparatus of sanctions and blockades are for - to make sure they don't make the wrong choice.