If you're talking about the "Irreconcilables"... Source: http://www.state.gov/r/pa/ho/time/wwi/89875.htm (I got this answer when I was studying for an essay from the "U.S. Department of State" website, the link listed above after 'Source'.) While the Treaty of Versailles did not present a peace agreement that satisfied all parties concerned, by the time President Woodrow Wilson returned to the United States in July 1919, American public opinion was overwhelming in favor of ratifying the treaty, including the Covenant of the League of Nations. Nevertheless, in spite of the fact that 32 state legislatures passed resolutions in favor of the treaty, there was intense opposition to it within the U.S. Senate. Senate opposition to the Treaty of Versailles cited Article 10 of the treaty, which dealt with collective security and the League of Nations. This article, opponents argued, ceded the war powers of the U.S. Government to the League's Council. The opposition came from two groups: the "Irreconcilables," who refused to join the League of Nations under any circumstances, and "Reservationists," led by Senate Foreign Relations Committee Chairman, Henry Cabot Lodge, who were willing to ratify the treaty with amendments. Hope this answers your question.