From the Overview: "Concerns over China's policies on intellectual property (IP), technology, and innovation led the Trump Administration in August 2017 to launch a Section 301 investigation of those policies. Consequently, the United States has implemented three rounds of tariff increases on a total of $250 billion worth of Chinese products, while China has increased tariffs on $110 billion worth of U.S. products. The Trump Administration has threatened to increase tariffs on nearly all remaining imports from China."
CRS In Focus, IF10708
Congressional Research Service: https://crsreports.congress.gov/