Legislative vs. Executive Powers

Congress, made up of the House of Representatives and the Senate, holds the power to write and pass federal law under Article I of the Constitution, the subject this site's House of Representatives, Senate, and How a Bill Becomes Law pages cover in full. No other branch can create new federal statutes on its own.

Congress alone controls federal spending. Article I, Section 9 bars any money from leaving the Treasury except through appropriations Congress has passed into law, which means every federal agency, including the military, depends entirely on funding Congress agrees to provide, a power covered in more depth on this site's federal budget pages.

The Constitution gives Congress the power to declare war, and gives the Senate specifically the power to ratify treaties by a two-thirds vote and to confirm the President's nominees for federal judgeships, Cabinet posts, and other senior positions through its advice and consent role.

Congress also holds the impeachment power, letting the House impeach and the Senate try and convict the President, Vice President, judges, and other federal officials for high crimes and misdemeanors, entirely independent of the regular election calendar, a check covered in detail on this site's Separation of Powers page.

The President enforces and administers the laws Congress passes, heading the executive branch's federal agencies and departments, including the fifteen Cabinet departments this site's Cabinet page covers, and deciding, within the law, how vigorously and in what specific way any given statute is actually carried out.

As commander in chief under Article II, the President directs the armed forces' operations, though Congress alone can formally declare war and controls the funding those operations depend on, a division of authority covered in this page's next tab in more depth.

The President conducts day-to-day foreign policy and negotiates treaties and international agreements, though a treaty does not carry binding legal force until the Senate ratifies it by a two-thirds vote, and nominates federal judges and senior officials, though the Senate must separately confirm the most significant of those nominations.

The President can veto legislation Congress has passed, subject to a congressional override by a two-thirds vote in both chambers, issue executive orders directing how the executive branch carries out its own existing authority, covered in more depth on this site's Executive Orders vs. Laws page, and grant pardons for federal offenses.

The Constitution gives Congress the power to declare war in Article I, Section 8, while Article II makes the President commander in chief once forces are deployed. In principle, that divides the decision to go to war from the conduct of a war already underway, but in practice the line between the two has been contested for most of American history.

Congress has formally declared war only five times, most recently in World War II, yet presidents have committed U.S. forces to combat many more times than that without a formal declaration, relying instead on the commander-in-chief power, specific congressional authorizations short of a formal war declaration, or, less often, claimed independent constitutional authority.

Congress attempted to reassert its role with the War Powers Resolution of 1973, passed over President Nixon's veto, which requires the President to notify Congress within 48 hours of committing forces to hostilities and generally limits deployments to 60 days without congressional authorization. Every president since has operated at least nominally within its reporting framework, even while some administrations have separately disputed its constitutionality.

The practical result is a genuine, ongoing gray zone rather than a settled rule: Congress retains the formal power to declare war and controls the funding any sustained military operation requires, while the President retains broad day-to-day authority to direct the military once deployed, and the exact boundary between the two has never been fully resolved by the courts.

The President conducts the government's day-to-day foreign relations and personally negotiates treaties with other countries, but a treaty carries no binding legal force under U.S. law until the Senate ratifies it by a two-thirds vote under Article II, Section 2, a considerably higher bar than the simple majority ordinary legislation requires.

That two-thirds requirement has sunk treaties presidents genuinely wanted, most notably the Treaty of Versailles after World War I, which the Senate declined to ratify in 1919 and again in 1920, keeping the United States out of the League of Nations the treaty would have created despite President Wilson's direct, sustained campaign for its approval.

Presidents have increasingly relied on executive agreements, which do not require Senate ratification, to conduct international commitments that fall short of a formal treaty. Executive agreements can cover substantial ground, but they generally rest on less durable legal footing than a ratified treaty and, depending on their basis, can be more easily reversed by a successor administration.

This creates real friction: a Senate unwilling to ratify a specific treaty cannot necessarily stop a President from reaching a similar arrangement through an executive agreement instead, while a President relying heavily on executive agreements risks building foreign policy commitments that lack the durability a ratified treaty would carry across future administrations.

Article II, Section 2 splits the appointment power cleanly in theory: the President nominates federal judges, Cabinet secretaries, and other senior officials, and the Senate must separately confirm them before they take office. Neither branch can fill these positions alone, a nomination the Senate refuses to confirm simply does not take effect.

In ordinary practice the large majority of nominations are confirmed, but the Senate's power to say no is real and has been exercised at the highest level, most visibly in the Senate's 1987 rejection of Supreme Court nominee Robert Bork by a 58 to 42 floor vote, one of the clearest examples of this check actually being used rather than remaining theoretical.

The Constitution also gives the President a narrower recess appointment power, letting the President temporarily fill a vacancy without Senate confirmation while the Senate is in recess, historically used when the confirmation process was slow relative to an urgent vacancy. The Senate has periodically used brief pro forma sessions specifically to prevent recesses long enough to trigger this power.

The Supreme Court weighed in directly in NLRB v. Noel Canning (2014), unanimously ruling that recess appointments President Obama made during a set of pro forma Senate sessions were invalid, holding that the Senate, not the President, gets to decide whether it is actually in recess for these purposes, a ruling that narrowed how future presidents can use the tool.