The South Carolina Republican Party appeared to violate its own rules on Saturday when the party's executive committee voted to cancel next year's primary election.

The executive committee voted nearly unanimously to cancel the primary because President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE had drawn "no legitimate primary challenger," the state party's chairman, Drew McKissick, said.

Trump has drawn two former Republican elected officials as challengers. Former Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE (R-S.C.), who served two terms as governor of South Carolina, is also considering joining the field.

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Any of those candidates may decide to sue the South Carolina GOP, some Republican insiders said, because Saturday's vote ran contrary to the state party's rules.

The rule that governs South Carolina's presidential preference primary allows the state party to cancel the primary only by a vote at the state party convention within two years of the subsequent primary.

South Carolina Republicans did not vote to cancel the primary at either of its last two conventions.

The rule gives the state Republican executive committee power to reverse a convention's decision to cancel the primary if "circumstances surrounding the presidential election shall have substantially changed such that a primary would be deemed advisable."

But it does not give the executive committee the opposite power — the power to unilaterally cancel the primary.

"This shady backroom deal where a small group of party insiders makes a big decision that stops thousands of voters from participating in the process appears to violate party rules and is precisely the kind of thing that turns people off to politics," said Rob Godfrey, a former state Republican Party communications director and a former top adviser to former South Carolina Gov. Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE.

"Bad for the party, the process and the president," Godfrey told The Hill.

McKissick said in a statement that there was "no rationale to hold a primary" because a Republican incumbent is seeking reelection. He pointed to 1984 and 2004, when Republican incumbents did not face primaries, and 1996 and 2012, when the state Democratic Party canceled its primaries and renominated incumbent presidents.

Asked about the rule governing presidential primaries, state Republican Party communications director Joe Jackson pointed to a separate rule.

That rule reads as follows: "These Rules shall be interpreted and applied so as to substantially accomplish their objectives. All records and lists required by the Rules shall be in writing. The spirit and not the letter of each Rule shall be controlling. Substantial compliance with a Rule shall be sufficient."

The potential rule violation could open up the state party to legal challenges from Trump's opponents.

"This isn't North Korea. This isn't Russia. In America, a President shouldn't be able to just cancel elections," former Rep. Joe Walsh Joe WalshSunday shows preview: Protests continue over shooting of Blake; coronavirus legislation talks remain at impasse Republicans officially renominate Trump for president Tucker Carlson responds to guest correcting pronunciation of Kamala Harris's name: 'So what?' MORE (R-Ill.), one of Trump's challengers, tweeted Saturday.

Trump's campaign has worked with several state Republican parties to stymie the possibility of a primary challenger in recent months, and to install pro-Trump leaders in state party roles.

Those efforts appear to be paying off for Trump, even at the expense of voters who would be overwhelmingly likely to support him in a primary. The Kansas Republican Party said Friday it would not hold caucuses next year, and at least two other state parties are considering ending their caucuses rather than opening Trump to a potential challenge.

The last several presidents who have faced primary challenges from within their own parties, George H.W. Bush and Jimmy Carter Jimmy CarterTexas Democrats roll out first wave of planned digital ads as Election Day nears Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Warning signs flash for Lindsey Graham in South Carolina MORE, each lost their subsequent elections.