The Kansas Republican Party is attempted to control the content of any 2018 Republican gubernatorial debates. The party itself will host debates, and specifies that (1) questions cannot be asked unless all participating candidates have a chance to answer the question; (2) the debates will not last longer than 90 minutes; (3) candidates can only talk about issues, but not about individual characteristics of opponents.

Furthermore, no candidate will be allowed to participate in any other Republican gubernatorial debate that has different rules. See this Kansas City Star editorial, which contains a link to a Wichita Eagle article giving additional details about the rules. Thanks to Nancy Brune for the link.