The governor can also be removed through an impeachment trial or through a recall election. An impeachment trial is carried out by the Wisconsin State Assembly, if a majority of its members agree to the impeachment. No governors have been removed from office through impeachment in the history of Wisconsin. However, Arthur MacArthur, Sr., who, as lieutenant governor, became acting governor upon the resignation of William Barstow in 1856, was removed after the Wisconsin Supreme Court ruled that Barstow's opponent in the previous election, Coles Bashford, was the election's legitimate winner.