CPT has its roots in the historic peace churches of North America, and its four supporting denominations are the Mennonite Church USA, Mennonite Church Canada, Church of the Brethren, and the Religious Society of Friends. It is also sponsored by several Christian groups: "Every Church a Peace Church", "On Earth Peace", "Presbyterian Peace Fellowship", "Baptist Peace Fellowship of North America", and the "Congregation of St. Basil". In conflict areas it works in partnership with Jewish, Muslim and secular peace organizations, such as the International Solidarity Movement and Peace Brigades International. Another component of CPT's work is to engage "...congregations, meetings and support groups at home to play a key advocacy role with policy makers."