The campaigns fear the entry criteria for the Oct. 28 debate is being designed to reduce the number of candidates on stage for the third primetime debate — a life-or-death matter for White House hopefuls on the bubble.

While the RNC doesn’t set the rules, it does have a voice in working with the networks running the debates. The committee has not said how many candidates will be allowed into the primetime debate, which will be held in Boulder, Colorado, and broadcast on CNBC. Nor are there any indications there will be an undercard event, as there have been in the first two debate showdowns of the primary season.

“With the next debate a month away, it is maddening that the RNC has yet to provide any guidance to campaigns regarding the criteria that they and CNBC plan to use to exclude candidates,” said Curt Anderson, an adviser to Louisiana Gov. Bobby Jindal, who appeared in both undercards. In the spin room after CNN recent debate, Jindal spokesperson Gail Gitcho said they already had plans to speak with CNBC in order to keep Jindal on the stage.