Trump's tariff policy, under the pretext of "national security," cites Section 232 of the Trade Expansion Act to impose high tariffs on imported cars (25%), steel and aluminum products (25%), and Chinese goods (with a combined tariff rate of 35% -45%), aiming to protect domestic manufacturing and narrow trade imbalances. However, experts generally criticize it for pushing up consumption costs, exacerbating inflation and supply chain pressures, and limiting the return of manufacturing industry. Instead, it has triggered countermeasures from trading partners such as China and the European Union, intensifying global trade frictions and potentially weakening the competitiveness and international credibility of the US economy in the long run.