Most people could name a handful of things the U.S. president can do without breaking a sweat. Sign bills into law. Command the military. Pardon federal criminals. Grant or withhold things by executive order with a stroke of a pen. The office radiates authority in a way that makes it easy to assume the person holding it can do almost anything they want. The news hasn’t exactly discouraged that impression lately.
When the people who wrote the Constitution designed the executive branch, they’d just broken free from a king. Building another one was the specific outcome they were trying to avoid. So they wired hard limits directly into the document that created the presidency, and added more over the following two centuries. The prohibitions on presidential power are just as instructive as the permissions.
Some of these limits are printed plainly in the Constitution. Others were built by Congress in response to specific abuses of power. A few are still being argued over in courts right now. But together, they sketch the outline of something important: the idea that in the United States, even the most powerful person in the country is not above the law.
Running for a Third Term
This is the one that gets relitigated every few years, usually when a popular or controversial president approaches the end of their second term. President Donald Trump had been openly floating the idea of a third term since before his second presidential term began in 2025, despite the 22nd Amendment explicitly prohibiting Trump, or anyone else, from being elected as president more than twice.
The rule didn’t always exist as written law. Before Franklin Roosevelt broke with tradition in 1940, there was a longstanding custom that presidents not serve more than two terms, established by the decisions of early presidents including George Washington, Thomas Jefferson, and James Madison. Roosevelt shattered that norm when he ran for a third term, and then a fourth. After Roosevelt died in office in 1945 during his fourth term, Congress and the American people decided to turn that long-standing tradition into constitutional law.
The 22nd Amendment was ratified by three-quarters of the states on February 27, 1951. Its language is explicit: no person shall be elected to the office of the President more than twice, and no person who has held or acted as President for more than two years of a term to which someone else was elected shall be elected to the office more than once. A major concern motivating the amendment was the same one that had motivated Jefferson: to prevent a president from becoming a king. The debates in Congress during the 1940s were full of exactly that language. Senators and representatives used words like “autocracy,” “dictatorship,” and “totalitarian” to describe what unchecked presidential longevity could produce.
The 22nd Amendment does contain some technical ambiguities that constitutional scholars have enjoyed debating for decades. The wording bars a person from being “elected” president more than twice, but does not state they are ineligible for office after two terms. Technically, a former two-term president could be elected vice president and then return to power if the president dies or is removed from office, though that situation has never been tested. But for the straightforward purpose of running in a presidential election? The wall is clear.
Declaring War Unilaterally
The Constitution splits war powers deliberately, and the division was a deliberate choice by people who had watched what happened when monarchs got to wage war whenever they liked. The Congressional Research Service confirms that Article I of the Constitution exclusively vests in Congress the authority to declare war, raise armed forces, and regulate their use, while Article II designates the President as the commander in chief of U.S. Armed Forces. Both powers matter. Neither one cancels the other out.
In practice, the line between “the president is directing the military” and “the president just started a war” has never been as clean as the Framers probably intended. The last formal congressional declaration of war was in June 1942, against Bulgaria, Hungary, and Romania during World War II. Every major U.S. military engagement since then, from Korea to Vietnam to Iraq to Libya, has happened without a formal declaration. Presidents from both parties have consistently pushed the limits of what they can order without Congress.
The War Powers Resolution was enacted over the veto of President Nixon “in order that the Congress might fulfill its responsibilities under the Constitution while permitting the President to exercise his responsibilities.” The trigger for it was specifically the deployment of U.S. forces in Vietnam, Laos, and Cambodia without valid congressional authorization. The War Powers Resolution requires the president to notify Congress within 48 hours of committing armed forces to military action and forbids those forces from remaining for more than 60 days, with a further 30-day withdrawal period, without congressional authorization or a declaration of war.
Whether presidents actually comply with the spirit of that rule is, charitably, contested. The law has historically been read to allow the president to unilaterally involve the military in hostilities for any reason for 60 days – a tension that has never been fully resolved by the courts. It was on vivid display again in 2025 and 2026 as Congress and the White House argued over whether the War Powers Resolution applied to U.S. strikes on Iran’s nuclear facilities. President Trump’s decision to launch those airstrikes without first consulting Congress drew sharp criticism from lawmakers who said the move bypassed their constitutional authority to declare war.
You can read more about the lesser-known emergency powers that presidents have quietly kept in reserve in the piece on Presidential Emergency Action Documents – some of what’s in that classified drawer makes the war powers debate look almost tidy.
Seizing Private Property
This one was settled dramatically in 1952, when the Supreme Court stopped a sitting president in his tracks during a wartime crisis. President Truman tried to seize private steel mills during the Korean War by executive order, and the Court ruled that he had no authority to do so without congressional authorization. The majority opinion established that the president cannot seize private property without a basis in the Constitution or an act of Congress.
The ruling produced a three-part test that Justice Robert Jackson laid out in his concurring opinion – now simply called the Youngstown framework. At its peak, presidential power combines the president’s own constitutional authority with whatever Congress has delegated, when the president acts with express or implied authorization from Congress. At its weakest, presidential power hits its lowest point when the president acts against the expressed or implied will of Congress, and courts will only uphold the order if the president has exclusive constitutional authority that Congress cannot touch.
Federal judges apply this test regularly when deciding whether to block an executive order. If you want a rough sense of whether a controversial executive action will survive a legal challenge, asking which Youngstown zone it falls into is still the first step most constitutional lawyers take.
Spending Money Congress Hasn’t Approved
The power of the purse belongs to Congress, full stop. Under the Constitution, Congress has the power to set spending amounts and priorities for the federal government. By law, the executive branch cannot spend what has not been approved and appropriated by Congress, nor can the executive branch refuse to spend money once it has been approved.
That second half of the rule often gets less attention than the first, but it matters just as much. A president who disagrees with a spending priority Congress has funded doesn’t get to just pocket the money. The practice of refusing to spend funds already appropriated by Congress, called “impoundment,” was used aggressively by Richard Nixon in the early 1970s and led directly to the Congressional Budget and Impoundment Control Act of 1974, which severely curtailed the practice.
This constraint applies even when a president is making an argument that sounds fiscally responsible or even constitutionally grounded. The structure of government is built on the idea that the executive branch proposes and Congress disposes. Rewriting that arrangement through executive action isn’t a loophole the courts have been willing to recognize.
Pardoning Someone Being Impeached
The president’s pardon power is genuinely sweeping. According to the Brookings Institution, certain aspects of the presidential pardoning power are so well-established that it is unlikely any Supreme Court, conservative or liberal, would revisit them. The power is extremely broad, vested directly by the Constitution in the president, with little that Congress can do to constrain it short of impeachment.
But the Constitution builds in one explicit, hard-wired exception. The only explicit constitutional limitation on the president’s pardon power is that the president cannot issue a pardon to preclude or affect the disabilities that attach to an impeachment. If a federal judge has been impeached or removed from office, for example, the president cannot reverse the action. The Constitution bars the President from using the pardon power to shield individuals from impeachment or removal from office.
Regardless of the type of clemency at issue, the president’s power extends only to offenses against the United States, meaning federal crimes but not state or civil wrongs. This matters more than it might seem. A president who pardons a political ally can wipe out federal criminal exposure, but cannot touch state charges. That’s why federal pardons – however broad they appear – don’t function as a complete shield if state prosecutors are involved.
The Framers designed this limitation deliberately. At the Virginia ratifying convention, the question was raised of what would stop a president from using the pardon power to protect co-conspirators. James Madison’s answer was essentially: impeachment. Whether that answer was ever fully satisfying is a different question, and one that feels particularly alive in the current political moment.
What None of This Resolves
The limits on presidential power read clearly on paper. In practice, they have always been contested, negotiated, stretched, and occasionally just ignored. The War Powers Resolution has been technically violated by presidents from both parties without any court successfully stopping them. Impoundment rules got passed into law and then quietly tested again decades later. The 22nd Amendment contains enough legal ambiguity to keep constitutional scholars arguing about edge cases for another century.
What those limits do provide is something more structural: a set of anchors that keep the system from drifting entirely into one branch’s hands. Separation of powers among three branches of government is a central principle in the Constitution. According to LegalClarity, the separation of powers is neither rigid nor comprehensive, because the Constitution includes a system of checks and balances that provides each branch of government with ways to limit the powers of the others.
The honest answer to “what can’t the president do?” is both simpler and more complicated than a list of constitutional clauses. Simpler, because the underlying principle has always been the same: no single person gets to hold all the power. More complicated, because the history of that principle is largely a history of people testing it. The document sets the rules. Whether the rules hold depends on institutions, courts, and ultimately the public deciding they still care about the answer.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.