The Supreme Court stands on the precipice of fundamentally reshaping the federal government’s balance of power. Three watershed legal confrontations—each initiated or supported by former President Donald Trump—threaten to redefine the boundary between executive and legislative authority over U.S. fiscal and monetary policy. If Trump’s legal theories prevail, they could grant present and future presidents near-total control over tariffs, appropriations, and the composition of the nation’s central bank, upending centuries of constitutional precedent.

Tariffs, Taxes, and Executive Power

At the heart of the first set of cases—Trump v. V.O.S. Selections and Learning Resources v. Trump—is Trump’s assertion of authority to impose wide-ranging tariffs without explicit congressional approval. Traditionally, the U.S. Constitution vests the power to levy taxes and tariffs with Congress. Yet, President Trump’s lawyers argue that by invoking the International Emergency Economic Powers Act (IEEPA) of 1977, the president can impose massive import taxes in response to what he deems an “unusual and extraordinary threat.”

Legal experts and at least ten federal judges disagree, noting that neither the Constitution nor IEEPA offers carte blanche for the executive to raise trillions in revenue—the Yale Budget Lab estimates $2.4 trillion from such tariffs over the next decade—without a specific legislative mandate. Critics warn that this would allow any president to effectively rewrite U.S. trade policy unilaterally, a power that could distort global markets and upend centuries of legislative checks on taxation.

The Biden and Obama administrations faced strict Supreme Court enforcement of the so-called “major questions doctrine,” which reserves big national policy shifts for Congress unless the law expressly delegates them to the president. If the Court now sides with Trump, critics argue, it risks partisan double standards and fundamentally weakens Congress’s constitutional role.

Presidential Power to Delay or Cancel Federal Spending

The Supreme Court’s “shadow docket”—a process by which some cases are decided quickly and without full briefing—currently includes Department of State v. AIDS Vaccine Advocacy Coalition. This case tests whether a president can unilaterally impound or withhold congressionally mandated spending, a practice explicitly prohibited by the Impoundment Control Act (ICA) of 1974, adopted in response to abuses by President Nixon.

Historically, impoundment—a president’s refusal to spend funds appropriated by Congress—has been deemed illegal. Even conservative jurists, including former Chief Justice William Rehnquist, dismissed the notion that a president could ignore clear legislative spending directives. Trump’s argument relies on technicalities within the ICA, contending that a late request for spending rescission can delay the expenditure until the deadline expires, thus circumventing Congress’s intent.

The immediate stakes are significant: $4 billion in foreign aid. But legal scholars caution that if upheld, the ruling could allow future presidents to effectively nullify entire government programs simply by running out the legislative clock. A lower court ruling currently favors congressional spending authority, but the Supreme Court’s final word is pending. Notably, Chief Justice Roberts has already permitted Trump to temporarily freeze these funds.

The Fed’s Independence Under Threat

The case of Trump v. Cook centers on Trump’s attempt to remove Federal Reserve Governor Lisa Cook, a Biden appointee, before her statutory term ends—an action only permitted “for cause” under federal law. Independent central banking is seen as essential to preventing inflationary or politically motivated manipulation of interest rates, with economic history recalling the damaging effects of presidential interference such as Richard Nixon’s pressure on the Fed in the 1970s, which led to years of stagflation.

If granted unchecked removal power, the president could pack the central bank with loyalists eager to pursue election-year economic booms at the cost of long-term stability. Despite a recent appellate ruling against Trump—and a history of the Supreme Court ratifying the Fed’s independence—there is concern that the current Court may lower the barriers for political interference.

Central bank independence is a cornerstone of most advanced world economies. According to the International Monetary Fund, loss of such independence is strongly linked to higher inflation and financial market volatility. U.S. and international financial stability may hang in the balance as the Supreme Court weighs its decision.

Constitutional Precedent and a Looming Crisis

The cumulative impact of these cases could be profound. The U.S. Constitution divides the power of the purse among the branches of government: only Congress may appropriate funds or impose taxes, while the president is charged with executing the laws. This separation ensures that no single official can command the nation’s economy unchecked—a legacy of the Founders’ aversion to monarchy and tyranny.

Yet, if the Supreme Court upholds Trump’s legal theories, the president would stand to wield vast fiscal tools, able to tax, spend, and shape monetary policy largely by decree. Critics warn that the Court, now with a solid conservative majority, risks abandoning long-standing norms in favor of partisan loyalty. In 2024, the Court already granted Trump broad immunity from criminal prosecution for official acts, a decision decried by constitutional scholars and former Justice Department officials.

“The outcome of these cases will determine the future of American democracy,” notes constitutional law professor Laurence Tribe. “The separation of powers was designed to resist dictatorship—or, at the very least, one-person rule.”

Global and Economic Implications

The world watches these proceedings with trepidation. U.S. fiscal and trade policy reverberate through global markets, and judicial acquiescence to expanded executive power could send shockwaves through alliances and trading partners. In the financial sector, changes in Federal Reserve governance are likely to drive volatility in U.S. Treasury yields and exchange rates, as uncertainty rises over American economic stewardship.

Americans, too, face direct consequences. Tariffs impact consumer prices and jobs; the politicization of economic levers risks boom-bust cycles. Without meaningful checks, the federal government could become more vulnerable to presidential whims, amplifying polarization and undermining public trust in institutions.