Once Trump agreed to move forward with the bill in July after over a year of delays, US officials pushed for quick passage to give Trump additional leverage in his meeting with Chinese President Xi Jinping next week, according to congressional sources.
US officials have tried to reassure lawmakers that the measure has sufficient guardrails, while acknowledging its significance in handing control of tariffs to the White House.
"It is the first time in nearly forty years that Congress has granted new tariff authorities to the executive branch," White House legislative director James Braid said in a post on X on Wednesday.
The White House did not respond to a request for comment on concerns about the broader scope of the measure.
The sweeping package, which passed Congress on Wednesday, aims to deprive Russia of funds used to pay for its nearly five-year war on Ukraine. The legislation authorizes sanctions against Russia's energy and defense industries, as well as its "shadow fleet" of tankers used to evade existing sanctions.
Moscow on Thursday said further US sanctions against Russia would make it harder to reach a peace deal in Ukraine.
Jeannette Chu, vice president of the National Foreign Trade Council, a trade group that advocates for open trade, said different entities had differing assessments of which countries could be hit with tariffs since no firm criteria were spelled out. The countries speculated as likely include Brazil, India, Japan and countries in the European Union, she said.
China said it "consistently opposed long-arm jurisdiction that lacks a basis in international law" while India warned Washington that new tariffs could impact bilateral ties.
In a worst-case scenario, Chu said, Ukraine itself could suffer if the new tariffs cut off Russian oil and gas supplies for refined products in EU countries, given it relies on diesel from refineries in Hungary and Slovakia.
Not everyone agrees the bill gives the Trump administration too much leeway. The conservative think tank Foundation for Defense of Democracies argues that the bill lays out sufficient criteria on which countries can be hit and rejects the idea that it gives Trump a back door to imposing other tariffs. It noted that the original version of the bill required even higher tariffs of 500%.