He made an unsuccessful bid for Congress last year, losing the GOP nod to Vicky Hartzler in Missouri's 4th District. Hartzler later unseated incumbent Democrat Ike Skelton.
The Missouri Senate has passed a resolution that would require voters to show photo identification at the polls.
The proposed constitutional amendment was passed without debate along party lines, with all seven Democrats voting "no" and all Republicans present voting "yes."
The Missouri House has voted to change the state's laws about workplace discrimination.
In a 95-59 vote Thursday, the House passed legislation that would change the legal standard people must meet when alleging in a lawsuit that they were fired for discriminatory reasons. The bill now goes to the Senate.