The rapid growth of the GOP presidential field is causing major headaches for party bosses ahead of a primary debate season that begins this summer.

The dilemma for Reince Priebus, Republican National Committee (RNC) chairman, is stark: If the declared field grows to 18 or 20 candidates, as now looks plausible, how can those numbers be winnowed in a way that seems fair and reasonable rather than arbitrary and undemocratic?

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“You’ve got to prevent it from becoming a ‘WWE SmackDown’ event on national television,” said GOP strategist Ford O’Connell. “You don’t want to bump everybody off the stage, but you have to realize your overarching goal is protecting the eventual nominee.”

“I would think that Reince Priebus has been thinking about exactly this issue, and also about how to ensure that the debates don’t turn into the ideological bloodfest that we saw in 2012, which pushed the whole ticket to the right,” said Cal Jillson, a political science professor at Southern Methodist University.

Already declared candidates — including Sens. Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE (Texas), Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (Ky.) and Marco Rubio Marco Antonio RubioSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE (Fla.) — are sure bets to get slots, as are former Florida Gov. Jeb Bush and Wisconsin Gov. Scott Walker, both of whom are expected to get in shortly. All are polling well in early surveys.

But with the GOP field still growing, where is the cutoff? By The Hill’s count there are around 22 candidates who have declared candidacies or may do so.

Michigan Gov. Rick Snyder is the latest GOP figure to leave the door ajar, telling Bloomberg TV on Monday that he is still mulling a run.

Ohio Gov. John Kasich also talked up a bid last week, and New Jersey Gov. Chris Christie — once a front-runner who has seen his stock tank — is still deciding, too.

Former Arkansas Gov. Mike Huckabee is expected to announce next week, along with black neurosurgeon Ben Carson and former Hewlett-Packard CEO Carly Fiorina, the only woman who looks likely to join the GOP field.

Many of these possible candidates can make a credible case for why they should be included, especially as the GOP seeks to broaden its base.

Snyder, for example, is governor of the nation’s 10th largest state, having won twice in blue-leaning Michigan. But he is scarcely mentioned as a real contender; he barely registers in polls, if he’s included at all.

Other possible candidates include South Carolina Sen. Lindsey Graham Lindsey Olin GrahamMomentum growing among Republicans for Supreme Court vote before Election Day Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Warning signs flash for Lindsey Graham in South Carolina MORE; businessman Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE; Govs. Bobby Jindal of Louisiana and Mike Pence of Indiana; former Govs. Rick Perry of Texas, George Pataki of New York, Bob Ehrlich of Maryland and Jim Gilmore of Virginia; former Pennsylvania Sen. Rick Santorum; former U.S. Ambassador to the United Nations John Bolton; and New York Rep. Pete King.

There is also the question of diversity to consider for Republicans, whose party is repeatedly painted as a redoubt of older white men.

A very large debate stage with only Rubio and Cruz offering ethnic diversity might tempt GOP leaders to try to ensure the inclusion of either Carson, who has a passionate following, or Fiorina, who has proven to be an aggressive critic of Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE, even if their polling numbers are unspectacular.

“It is important to have some diversity on the stage, but it is not going to last very long in the cases of Fiorina and Carson,” Jillson predicted.

Put it all together, and it poses a real dilemma for the RNC. The first televised debate is already set for August in Ohio on Fox News. The following three months will see further encounters in California on CNN, in Colorado on CNBC and in Wisconsin on Fox Business.

Discussions are understood to be underway between the networks and the RNC as to how the field might be narrowed down to a manageable size. Most observers assume some kind of poll-rating threshold will need to be met in order for a candidate to earn his or her place on the debate stage.

It is also possible that fundraising strength could be factored in, although applying that yardstick, even in conjunction with others, would seem to be problematic for a party often portrayed by liberals as having an overly cozy relationship with super wealthy donors.

RNC spokeswoman Allison Moore would say only the attempt to find a practical solution was “a work in progress.”

It is expected, however, that the RNC will issue the criteria for inclusion a considerable time in advance of the first debate. Releasing the rules only on the brink of that initial encounter would leave party bosses vulnerable to accusations of reverse engineering the rules to choose the field they want.

Some independent observers, however, note that even the basic measure of using poll ratings to disqualify contenders from the debate stage is questionable.

During the 2012 cycle, Santorum was polling very poorly early on, only to win the Iowa caucuses and become the most serious intraparty challenger to eventual nominee Mitt Romney.

He ultimately proved a much stronger contender than others who enjoyed early polling waves, including businessman Herman Cain and then-Rep. Michele Bachmann Michele Marie BachmannEvangelicals shouldn't be defending Trump in tiff over editorial Mellman: The 'lane theory' is the wrong lane to be in White House backs Stephen Miller amid white nationalist allegations MORE (Minn.).

“Early on, it’s a name-recognition game when it comes to polling,” said Tobe Berkovitz, a Boston University professor who specializes in political communications. “If you are going to say you have to meet a certain polling criteria, then it really becomes a question of ‘who becomes best-known?’ or ‘who has just broken into a news cycle?’ ”