Incoming Democratic majorities could seek to curb US tariffs, scrutinize mining deals

Democrats’ takeover of the US Congress in 2027 could bring heightened scrutiny of President Donald Trump’s deals with mining companies and an effort to curtail executive tariff authority, but ultimately, policies advancing domestic metals and mining are likely to enjoy bipartisan support, observers and analysts told Platts.

Democrats won sweeping victories Nov. 3, securing substantial majorities in both the House of Representatives and the Senate. Newly Democratic-led committees could open investigations, hold hearings and issue subpoenas related to the administration’s investments and critical minerals deals. And the party could also use its congressional majorities to advance legislation aimed at limiting presidential tariff authority, including tariffs on steel, aluminum and copper.

However, Democrats’ ability to unwind Trump’s policies could be constrained, experts said. The president could veto legislation seeking to curb the executive branch’s trade authority, and Democrats may be reluctant to reverse initiatives intended to strengthen US critical minerals supply chains.

“I think the metals and mining space is susceptible to some of the same kinds of thematic drivers of oversight and investigations as many other industries, and really the common nexus is proximity to Trump administration policies, administration objectives and government contracts,” Tom Moyer, a partner at Bracewell who leads the congressional investigations practice, told Platts, a part of S&P Global Energy.

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