The Montana Republican Party (MTGOP) is the affiliate of the Republican Party in Montana. It is headquartered in Helena. The party is chaired by Don Kaltschmidt. The national committeeman is currently unknown and the national committeewoman is Debra Lamm. The party is a private corporation organized of political organizations, including political action, advocacy, and interest groups. It is currently the dominant party in the state, controlling Montana's at-large U.S. House seat, one of the U.S. Senate seats, both houses of the state legislature, and the governorship.