Biden’s greatest diplomatic achievement has been to create a loose, but tightening, series of alliances to contain China. Trump, as we know, tends to reject the work of anyone who comes before him. The question, then, is whether Trump would revert back to form and treat our allies as parasites whose only objective is to steal American jobs. By doing so, he would surrender the greatest advantage we have relative to the Chinese.
There would be enormous pressure from the GOP leadership to stay the course, but he might well ignore it. I make no predictions on that score.