Abstract: This article proposes that the U.S. Senate adopt a “popular-majoritarian cloture rule,” under which a motion to close debate and proceed to a final vote would carry if but only if supported by a majority of Senators who collectively represent a larger share of the population than those Senators in opposition. This rule, which would be a constitutional exercise of the Senate’s power to set the rules of its proceedings, would make the body more democratic and more functional, and would be preferable both to the current filibuster rule and to simple majority rule.