From the Document: "The trade practices of U.S. trading partners and the U.S. trade deficit are a focus of the Trump Administration. [...] The multiple tariff increases applied to date, ranging from 10% to 45%, affect approximately 10% ($267.5 billion) of U.S. annual imports (Figure 1). While the Administration has taken some steps to reduce the scale of imports affected by the tariffs (i.e., by exempting Canada and Mexico from the steel and aluminum duties and creating processes by which certain products may be excluded), the general trend is an escalation of tariff actions."
CRS Insight, IN10971
Congressional Research Service: https://crsreports.congress.gov/