Sec. 4. The city-county legislative body may:
(1) expel any member for violation of an official duty;
(2) declare the seat of any member vacant if the member is unable or fails to perform the duties of the member's office; and
(3) adopt its own rules to govern proceedings under this subsection.
However, a two-thirds (2/3) vote is required to expel a member or vacate the member's seat.