Just to add, I work with this stuff all day as a Licensed Customs Broker. The US already has a lot of low tariffs (duties) on a huge range of goods. There are also a lot of free trade agreements in place that reduce or eliminate these tariffs if certain requirements can be met. The first round of tariffs on China are still around, tons of products from China already have 25% duty on top of the ‘normal’ duty rate for a said product.

I am curious what mechanism they will use to try and impose the tariffs quickly - there are only certain legal ways to do this and they take time and some need Congressional approval and investigations.