When Gov. Kim Reynolds interviews practically your entire Republican presidential area on the Iowa State Fair subsequent month in a sequence of one-on-one chats, there can be an particularly notable absence: former President Donald J. Trump, the race’s clear front-runner.

Ms. Reynolds’s workplace on Tuesday launched a listing of members for the interview sequence that didn’t embrace Mr. Trump. The former president, who has expressed his anger at Ms. Reynolds for not endorsing him, declined an invite to take part.

While it’s conventional for Iowa governors to remain on the sidelines of presidential primaries, Mr. Trump’s camp believes Ms. Reynolds is neutral in name only, pointing to a sequence of occasions she has attended with Gov. Ron DeSantis of Florida, Mr. Trump’s chief rival.

Mr. Trump seems intent on prolonging his public feud with the favored Ms. Reynolds, which has angered and puzzled conservatives within the state. One Republican state senator even flipped his endorsement from Mr. Trump to Mr. DeSantis after the spat. Mr. Trump, assured in his lead over the remainder of the sphere, has proven a wider willingness to skip essential major occasions, doubtlessly together with the first Republican presidential debate in late August, which he has not dedicated to attending.

The interviews with Ms. Reynolds, known as the “Fair-Side Chats,” will happen between Aug. 10 and Aug. 18 at JR’s SouthPork Ranch on the Iowa State Fairgrounds in Des Moines. The Iowa State Fair — well-known for its fried meals on sticks and life-size butter cow sculpture — is a crucial opportunity for presidential hopefuls to mingle with voters forward of the state’s caucuses in January.

Steven Cheung, a spokesman for Mr. Trump, stated the previous president deliberate to attend the state truthful — simply not the interview with Ms. Reynolds.

“President Trump looks forward to interacting with tens of thousands of Iowans at the fair in an open and unfiltered setting,” Mr. Cheung stated in a press release.

Of the opposite main Republican presidential candidates, solely former Gov. Chris Christie of New Jersey won’t take part in an interview with Ms. Reynolds. Mr. Christie’s marketing campaign has said he’s selecting to compete in New Hampshire and South Carolina, the opposite early nominating states, over Iowa.

Otherwise, the remaining main candidates, together with Senator Tim Scott of South Carolina, in addition to lengthy pictures just like the businessman Perry Johnson, agreed to attend.

“The Iowa State Fair showcases the best of Iowa — from our people to our culture and wonderful agriculture industry — and it’s the perfect venue for a conversation with the candidates,” Ms. Reynolds stated in a press release.

Mr. DeSantis, in the meantime, has appeared to eagerly domesticate his relationship with Ms. Reynolds, telling reporters at a marketing campaign cease within the state this month that he would think about her as a working mate, ought to he win the nomination.

“I mean, she’s one of the top public servants in America,” he stated.

Recent polls show Mr. DeSantis in second place in Iowa, a state lots of his allies say he should win, trailing Mr. Trump by roughly 30 proportion factors. The governor is scheduled to start a bus tour of the Des Moines space on Thursday earlier than talking at a dinner for the Republican Party of Iowa on Friday. Almost all the opposite candidates, together with Mr. Trump, are additionally set to speak on the dinner.