Since last month, there has also been an increase in support for broad tariffs that target the European Union and China. Voters also generally supported tariffs on certain industries, such as steel, iron, plastics, precious metals, and airplanes.

Countries are stepping up in response to the tariffs, offering to reduce or remove their own on imports from the United States.

Trump declared on Friday that To Lam, the leader of Vietnam, is prepared to remove tariffs in order to avoid penalizing the Southeast Asian country for new U.S. duties placed on its imports.

“I just had a very fruitful call with To Lam, the General Secretary of the Communist Party of Vietnam, and he informed me that if they can reach an agreement with the United States, Vietnam wants