In all prosecutions, the accused shall be allowed to appear and defend in person, or by counsel; to demand the nature and cause of the accusation against him; to meet the witness face to face, and to have compulsory process to compel the attendance of the witnesses in his behalf, and a speedy public trial by an impartial jury of the county or district in which the offense is alleged to have been committed. No person shall be a witness against himself, or be twice put in jeopardy for the same offense.