Supreme Court Limits Trump on Tariffs and Fed While Expanding His Regulatory Power

The Supreme Court concluded its term by granting President Trump broader authority over the federal bureaucracy than any modern president has held, while simultaneously blocking two of his most market-sensitive ambitions: sweeping emergency tariff powers and direct control over the Federal Reserve. The twin defeats leave investors and businesses navigating a White House with a freer hand over most regulatory agencies but constrained at the two levers most likely to move markets.

Court Blocks IEEPA Tariffs and Fed Firing

The court ruled that Trump could not use the International Emergency Economic Powers Act to impose wide-ranging tariffs, striking down one of his fastest and most expansive trade tools. In a separate but related action the same term, the court denied the administration's bid to immediately remove Federal Reserve governor Lisa Cook, upholding Congress's requirement that the president clear legal and procedural hurdles before ousting a sitting Fed official.

Chief Justice John Roberts, writing on the Fed question, cited the Founders' understanding of the "calamities" that could follow from even the "suspicion" of political manipulation of monetary policy — language the court used to explicitly carve the central bank out from a broader ruling on presidential removal power it issued the same day.

What the Fed Ruling Meant for Markets

Investors had closely tracked the Cook case because unchecked White House authority to remove Fed officials risked eroding the central bank's independence and its resolve to contain inflation, particularly when that goal conflicts with administration priorities. That erosion, in turn, threatened to unsettle the Treasury market and raise borrowing costs across the economy. The court's carve-out preserves those guardrails for now.

Regulatory Pendulum Shifts With Each Election

The same term delivered a significant expansion of Trump's power elsewhere. The court allowed him to fire Federal Trade Commission officials at will, weakening Congress's ability to insulate independent agencies from direct White House control. Graham Steele, a former Treasury official in the Biden administration, said the rulings mean a new president can now "clean house" at agencies overseeing antitrust, consumer protection, and other major areas of economic regulation. Steele described the result as a "regulatory pendulum" that swings with partisan control of the White House — a condition businesses and investors typically price as uncertainty.

Battles Continue on Both Fronts

Neither ruling closed its underlying dispute. The Trump administration has continued pursuing tariffs through legal authorities other than IEEPA following the court's decision. On the Fed, Trump has indicated his administration will keep examining whether it can ultimately remove Lisa Cook through other means. The court preserved the Fed's independence; the White House has signaled the question remains open.