Democrats could also turn up the pressure on businesses.

Henrietta Treyz of consultants Veda Partners says Democrats will question companies that passed on the cost of tariffs to customers.

After the Supreme Court ruling in February, she says, the question will be: “Did you turn around, take that tariff rebate, and then lower prices for consumers?”

Companies will also be asked: “What did you get in exchange?”

Democrats, she adds, will “pick and choose very carefully.”

In the Senate, Ron Wyden, the Oregon Democrat set to chair the Finance Committee, has summed up his approach in six words: “affordability for us, accountability for them.”

He says he will use the committee to “reassert congressional authority” over trade policy. Insurers, drugmakers and banks should expect to be called to explain themselves.

And some of the biggest changes may happen closer to home. State governors and regulators have a say in electricity prices, while local authorities decide where new homes can be built.

Democrats have won governorships in Texas, Ohio and Georgia, where the rising cost of electricity for data centres is already a concern.