DES MOINES, Iowa (AP) — The Des Moines Register, CNN and its polling partner have decided not release the final installment of its presidential preference poll, fearing its results may have been compromised.

Carol Hunter, the executive editor of the Iowa newspaper, posted the announcement Saturday night at the same time the results of highly anticipated survey were supposed to be released.

Hunter said that one of the poll respondents reported concerns earlier in the day, which raised questions about the integrity of the results.

“It appears a candidate’s name was omitted in at least one interview in which the respondent was asked to name their preferred candidate,” Hunter wrote in an article posted on the Register’s website.

“While this appears to be isolated to one surveyor, we cannot confirm that with certainty. Therefore, the partners made the difficult decision to not to move forward with releasing the Iowa Poll.”

CNN political director David Chalian said it wasn’t clear whether the issue with the single respondent was an isolated incident.

“So out of an abundance of caution CNN and the Des Moines Register and Seltzer, the company who conducts the poll, decided not to release tonight’s poll,” Chalian said. “We take the standards that we apply to our polling very seriously.”

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