HJR 12 -- Impeachment Trials Sponsor: Emery Upon voter approval, this proposed constitutional amendment requires impeachments to by tried by the Senate. If the Governor is to be tried, the Chief Justice of the Missouri Supreme Court will preside. No person will be convicted without a two-thirds vote by all senators present. Currently, impeachments are tried before the Missouri Supreme Court or a special commission of seven jurists selected by the Senate.Copyright (c) Missouri House of Representatives