He can use section 223 of the Trade Expansion Action Act of 1962 (along with section 301 of the Trade Act of 1974) to levy tariffs on specific industries and sectors, like Joe Biden did on Chinese steel, semiconductors, electric vehicles and other products during his term. Or – as he’s recently threatened – he can use another section of the 1974 trade act to increase tariffs to 15% for 150 days which gives him “balance-of-payments authority”.