The Senate’s Treaty Filibuster Is a Constitutional Dodge

Every so often, the Senate takes up a treaty, and the first words you hear are not about war, peace, sovereignty, or American interests. They are a flat procedural phrase: I move that the Senate proceed to executive session to consider Treaty X. Most Americans tune out immediately. That is understandable. But that motion, the motion to proceed to executive session for a specific treaty, is one of the most revealing maneuvers in the United States Senate. It explains why some treaties never receive the up-or-down vote the Constitution actually contemplates, even after years of waiting.

The Text Is Not Complicated

Article II, Section 2 gives the President the power to make treaties, but only with the Senate's advice and consent, provided two thirds of the Senators present concur. That is the entire supermajority requirement. The Constitution does not say a treaty must first survive a procedural cloture vote. It does not say forty-one senators may block consideration of a treaty indefinitely. It says the President makes treaties, and the Senate either gives or withholds its consent by a two-thirds vote of the senators present.

That two-thirds threshold is deliberately high. The framers wanted treaties, especially those touching national security, commerce, and foreign alliances, to require broad, durable consensus. Alexander Hamilton explained the logic in Federalist No. 75: the treaty power is too consequential to be exercised by a bare majority of a single chamber. The supermajority was the safeguard. Hamilton understood that foreign commitments bind the nation in ways ordinary laws do not. That is precisely why the Constitution sets one demanding bar and then leaves the Senate to deliberate.

The Hidden Second Bar

What almost nobody says plainly is that the modern Senate has added a second, hidden hurdle on top of that constitutional safeguard. And that hurdle exists not to protect the republic, but to protect senators from having to vote. Under current Senate practice, when the majority leader wants the Senate to take up a treaty, he makes a motion to proceed to executive session for that specific treaty. That motion is debatable. Because it is debatable, it can be filibustered. Under Senate Rule XXII, ending a filibuster on that motion requires sixty votes, three-fifths of the senators duly chosen and sworn.

So the full sequence looks like this. A treaty sits on the Senate's Executive Calendar. The majority leader asks the Senate to proceed to it. Opponents filibuster the motion to proceed. Supporters must find sixty votes just to begin the debate. Once debate begins, the resolution of ratification itself can be filibustered, which means another sixty-vote cloture vote. Only then does the Senate take the final vote, which still requires two-thirds of the senators present.

To a casual observer, that may sound like a thick wall of protection around the treaty power. But the truth is different. The extra procedural steps do not strengthen the two-thirds requirement. They simply let the Senate avoid voting on the merits at all.

The Arithmetic Nobody Runs

Assume all one hundred senators are present. The Constitution says a treaty passes if sixty-seven senators vote yes. A committed minority of thirty-four can defeat it. Senate Rule XXII says a filibuster on the motion to proceed can be shut off by sixty votes.

Now do the arithmetic. If a treaty has sixty-seven committed supporters, those sixty-seven senators can provide sixty votes for cloture. The filibuster breaks. The treaty moves toward a final vote. If a treaty has sixty-six or fewer supporters, it cannot reach the two-thirds majority required on final passage anyway. The treaty would fail even if it reached the floor. In the ordinary case of full attendance, the motion-to-proceed filibuster is constitutionally redundant. It cannot block a treaty that actually has the two-thirds support the Constitution requires. What it can do is delay, obscure, and ultimately prevent a final recorded vote.

There is an additional wrinkle worth watching. The Constitution says two-thirds of the senators present, not two-thirds of the full Senate. If only eighty senators are present, a treaty can pass with fifty-four votes. Yet cloture still requires sixty votes regardless of attendance. In that situation, the Senate's internal rule imposes a higher threshold than the Constitution itself demands. That is not an implementation of the Treaty Clause. It is an amendment by rulebook.

The Seen and the Unseen

Henry Hazlitt taught that the bad economist sees only the visible effect of a policy; the good economist sees the unseen. The visible effect of the motion-to-proceed filibuster is senators arguing about procedure on C-SPAN. The unseen effect is that a treaty can be effectively killed without a single senator having to go on record for or against the actual treaty.

A senator can tell pro-treaty interests, I support the treaty, while voting against cloture. He can tell anti-treaty interests, I oppose the treaty, without ever casting a vote against it. The procedural shell game lets politicians escape accountability in both directions. That is not how a constitutional republic is supposed to function.

Take the U.N. Convention on the Law of the Sea. I would vote against that treaty on substance. I believe it would create an international regulatory authority with the power to tax and govern the deep seabed, and it would become one more slow surrender of American sovereignty. I am happy to say so plainly. But here is the uncomfortable truth: that treaty has not been rejected by a two-thirds vote. It has spent years stranded on the Senate's Executive Calendar, never brought to a final up-or-down decision. The threat of procedural paralysis plays a central role in that stasis.

Opponents do not have to assemble thirty-four votes to defeat it on the merits. They simply make the procedural price of taking it up higher than the Senate's time and attention can bear. The public never gets to see where each senator stands. That is evasion dressed up as deliberation.

A Modest Fix

I am not arguing that the Senate should make treaties easier to ratify. I am not arguing that the two-thirds requirement should be weakened. If anything, I want the Senate to take treaties more seriously, not less. What I am arguing is this: the Senate should amend its rules so that a motion to proceed to executive session for a specific treaty is not debatable.

If senators want to debate the treaty, fine. Debate it under the two-thirds rule. Let the resolution of ratification receive full deliberation. But the question of whether the Senate should even begin that debate ought to be settled by a simple majority. The final vote on ratification would still require two-thirds of the senators present. That is the constitutional gate. It is enough.

I am not a reflexive opponent of the legislative filibuster. In ordinary legislation, the sixty-vote threshold has sometimes served as a useful brake on transient majorities. But treaties are different. The Constitution already imposes its own supermajority. Piling another veto on top of that is not an act of constitutional fidelity. It is evasion.

The Senate has the power to change its own rules under Article I, Section 5. Nothing in the Constitution requires the motion to proceed to be debatable. That requirement is a creature of Senate precedent and Senate convenience. A simple change, made carefully and in the open, would restore the Treaty Clause to its original operation without touching the two-thirds safeguard.

A Motion to Proceed or a Motion to Hide?

Justice Antonin Scalia spent his career insisting that the Constitution means what its text says, not whatever a majority of judges or senators happen to want it to mean in any given era. The Treaty Clause is not complicated. It sets one bar for the Senate's consent. The Senate's internal procedures are supposed to implement that bar, not replace it with a shadow supermajority that lets members hide from their constitutional duty.

The next time you hear a senator say, I move that the Senate proceed to executive session to consider a treaty, do not let the dullness fool you. That motion is not a motion to proceed. It is a motion to avoid. It is a procedural trap that allows a minority of the Senate to keep a treaty off the floor indefinitely, not because the Constitution requires it, but because senators would rather not go on record. The Constitution already set the bar for treaties. It is long past time for the Senate to live by that text, and to stop hiding from it.