https://www.wired.com/story/china-conquers-mexican-automotive-market-and-the-us-is-worried/
State department hand wringing that China is going to use the US trade agreements as they were designed is 
I fully expect them to redo these with “except china” clauses.
The tariff is in place to prevent Chinese EVs from setting up shop in the first place. Taxed at 100%, no one will buy so why bother selling here?