Democratic Midterm Sweep Won't Unwind Trump's Tariff Machine

Democrats swept the House, the Senate and a historic number of down-ballot races on November 3 — and the tariff regime that has reshaped U.S. freight flows barely noticed. Ontario's premier may have been, as one observer put it, "doing cartwheels down the street" the morning after. The cartwheels are premature.

The constitutional math is unkind to hopes of a trade-policy reversal. Major trade treaties like the U.S.-Mexico-Canada Agreement need Senate ratification, and Senators confirm appointments such as the U.S. Trade Representative. But the tariff architecture itself rests on statutes that delegate power directly to the executive branch. Congress can't switch off what it handed over, at least not easily.

"I don't think one should assume tariffs are going away," says Mark Herlach, global co-chair of competition, trade and foreign investment at Eversheds Sutherland. "It's highly unlikely that Congress could amend those laws in a way that would limit the president's power. He still has the power of veto."

What does the midterm result actually change?

Not the January 1 deadline, for starters. A raft of fresh punitive tariffs on U.S. imports from Canada is still looming, with trade talks back underway. Ottawa may find the political shift creates a friendlier negotiating environment — but the deadline clock keeps running regardless of who controls which chamber.

There's also a cautionary tale here, and it's recent. In February 2026 the Supreme Court overturned Trump's tariffs issued under the International Emergency Economic Powers Act. It looked like a watershed. It wasn't. Different tariffs, under different laws, followed quickly — and these ones have stuck.

The USMCA itself sits in legal limbo beyond Congress's reach: not canceled, not renegotiated, and not entirely reliable. Bottom line, as the lawyers see it: Trump is still president, with extensive powers to impose whatever tariffs he pleases.

Jennifer Schwesig, partner and leader of Armstrong Teasdale's international practice, explains the mechanics. "IEEPA was the one tool with no investigation, no cap and no time limit. Once it was gone, the administration had to rely on statutes that, in some cases, need Congress to act at the end," she says. Litigation offers only a slow and narrow check. "Courts have been very deferential on national security findings under Section 232," she adds, referring to the Trade Expansion Act of 1962.

Herlach points to ongoing challenges in the Court of International Trade against tariffs issued under Section 301 of the Trade Act of 1974. The judgment is slow in coming. Whatever it says, further legal challenges are almost certain.

What does this change for shippers and retailers?

"With Democrats taking both the House and Senate, Congress has more leverage to scrutinize tariffs and push for targeted relief," argues Nishith Rastogi, chief executive technology officer of logistics software provider Locus. Then the cold shower: "I would not expect that to change this holiday season's shipping plans or costs."

The real question, Rastogi says, is whether anything shifts within six months that affects retailers' next round of orders. The timing dilemma is genuine:

• Delay replenishment, and if relief doesn't arrive, you pay the same duties plus a rush premium to move inventory fast.
• Import now, and if duties fall later, you've overpaid versus competitors who waited — but you're better positioned to keep products in stock.

Congress does hold oversight levers: the power of the purse and committee investigations. The most effective move would be passing a law limiting presidential authority. "I think that is highly unlikely," says Herlach. "You'd need a pretty strong consensus that something had to change."

That consensus probably isn't coming, because tariff politics don't run on party lines. A district full of manufacturers dependent on imports that can't be produced domestically sees tariffs as a barrier. A steel-state constituency sees protected American jobs. "It's a cliché, but it's true; all politics are local," says Herlach. So individual representatives will fight their corners against formidable legal obstacles, rather than as a unified caucus sworn in January 1.

One outside variable could matter for rates: the conflict in Iran. "Congress can also increase pressure over the conflict in Iran," says Rastogi. Even so, don't queue up the good news. "Any easing in diesel prices would take time to reach carrier rates," he admits.

The lame-duck question

Much now depends on coordinated will during the lame-duck period. "Congress will have to collectively make some decisions about where their priorities lie during this lame duck period; where they want to put their time and effort," says Herlach. "One might assume that other issues, like inflation, will be front and center, and tariffs are a part of that, so might be part of that push. But Congress would need the votes, and it's unclear that they would [get them]."

Herlach's verdict on the administration's trajectory is blunt. "I don't think we'll see a significant change to this administration's approach to tariffs, since it's been such a signature approach. Looking at what this administration has done in the first two years: they've constantly pushed the envelope as regards presidential power over trade policy. What happened [on November 3] may simply not be very interesting from a trade tariff perspective."

His one caveat: watch the trading partners. With a web of bilateral trade agreements in play, partners "may re-evaluate what kind of concessions they are willing to make given this election, but that will be case by case basis and depend on a lot of factors."

For now, the January 1 tariff deadline stands, the veto pen is full of ink, and shippers should plan on paying duties they can currently see.