Mont. Const. art. V, § 13

Impeachment. (1) The governor, executive officers, heads of state departments, judicial officers, and such other officers as may be provided by law are subject to impeachment, and upon conviction shall be removed from office. Other proceedings for removal from public office for cause may be provided by law. (2) The legislature shall provide for the manner, procedure, and causes for impeachment and may select the senate as tribunal. (3) Impeachment shall be brought only by a two-thirds vote of the house. The tribunal hearing the charges shall convict only by a vote of two-thirds or more of its members. (4) Conviction shall extend only to removal from office, but the party, whether convicted or acquitted, shall also be liable to prosecution according to law.