In U.S. politics, the majority leaer is a partisan position in a legislative body. If the presiding officer of the body is not elected by the body itself, the majority leader is the floor leader of the majority caucus; otherwise, the majority leader is the second-most senior member of the majority caucus, while the floor leader becomes the presiding officer. Given the two-party nature of the U.S. system, the majority leader is almost inevitably either a Republican or a Democrat.