Mo. Const. art. III, § 7
(a) Within sixty days after the population of this state is reported to the President for each decennial census of the United States, or within sixty days after a redistricting plan has been invalidated by a court of competent jurisdiction, the state committee and the congressional district committees of each of the two political parties casting the highest vote for governor at the last preceding general election shall meet and the members of each committee shall nominate, by a majority vote of the elected members of the committee present, provided that a majority of the elected members is present, members of their party, residents in that district, in the case of a congressional district committee, as nominees for the senate independent bipartisan citizens commission. No party shall select more than one nominee from any one state legislative district. The congressional district committees shall each submit to the governor their list of two elected nominees. The state committees shall each submit to the governor their list of five elected nominees. Within thirty days thereafter the governor shall appoint a senate independent bipartisan citizens commission consisting of two nominees from each list submitted by each state committee and one nominee from each list submitted by each congressional district committee, to redistrict the thirty-four senatorial districts and to establish the numbers and boundaries of said districts. No person shall be appointed to both the house independent bipartisan citizens commission and the senate independent bipartisan citizens commission during the same redistricting cycle.
If any committee fails to submit a list within such time, the governor shall appoint a member of his or her own choice from the political party of the committee failing to submit a list, provided that in the case of a congressional district committee failing to submit a list, the person appointed to the commission by the governor shall reside in the congressional district of such committee.
Members of the commission shall be disqualified from holding office as members of the general assembly for four years following the date of the filing by the commission of its final redistricting plan.