Earlier quoted context omitted.
I asked the google and it appears a big chunk of Chinese imports are agricultural products. Farmers not having a market to sell their products into isn't such a good thing for any administration so they seem to have a bunch of leverage on this point alone.
China can hit American farmers, but their overall trade surplus is $295 billion. The US has much more leverage.
So while tariffs will stop some importation of Chinese goods due to costs others are just going to cost more for consumers until the proposed US manufacturing capacity is build up.
Same with auto parts, even the US car makers rely on foreign made parts and have no real alternatives.