That's not really fair to Trump, who has long been a huge fan of tariffs.
Navarro is just the idiot sycophant who agreed with him that they are great.
It's worse than that. Navarro has sincerely held these views (that imports are inherently bad for the economy) for a long time. He is to economists what flat earthers are to astronomers. Imagine if an anti-vax activist was hired at the Depart of Health. Oh, wait...