A congressional caucus is a group of members of the United States Congress that meet to pursue common legislative objectives. Formally, caucuses are formed as congressional member organizations (CMOs) through the United States House of Representatives and the United States Senate and governed under the rules of these chambers. In addition to the term caucus, they are sometimes called conferences (especially Republican ones), coalitions, study groups, task forces, or working groups. Many other countries use the term parliamentary group; the Parliament of the United Kingdom has many all-party parliamentary groups.