This might get you closer...
@Chapter 115 Election Authorities and Conduct of Elections Section 115.761
115.761. 1. The official list of presidential candidates for each established political party shall include the names of all constitutionally qualified candidates for whom, on or after 8:00 a.m. on the fifteenth Tuesday prior to the presidential primary, and on or before 5:00 p.m., on the eleventh Tuesday prior to the presidential primary, a written request to be included on the presidential primary ballot is filed with the secretary of state along with:...
I don't see anything about challenges. Good lick.