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SIOUX FALLS, S.D. (AP) — Former Public Utilities commissioner Dusty Johnson said Wednesday that he won’t run negative ads in South Dakota’s Republican congressional primary after his leading opponent started airing spots criticizing his use of a state airplane.

Johnson, Secretary of State Shantel Krebs and first-term state Sen. Neal Tapio are vying for their party’s nomination in the June 5 U.S. House primary. Krebs released an ad last week alleging Johnson used his former job as a top gubernatorial aide to “abuse the state plane for personal convenience,” a claim Johnson calls untrue.

Krebs has also faced negative advertising in the primary: An out-of-state super PAC has spent more than $240,000 to oppose her, the Rapid City Journal reported . Johnson said he hasn’t coordinated with the group.

Poll results released Wednesday by the Argus Leader and KELO-TV say Johnson has a significant lead among likely primary voters. Forty-one percent of respondents said they would vote for Johnson, 23 percent said they would cast their ballots for Krebs and 13 percent said they’d support Tapio.

But 23 percent of those interviewed were undecided. Florida-based Mason-Dixon Polling & Strategy’s telephone poll of 625 registered South Dakota Republican voters was conducted May 21-23 and has a margin of error of plus or minus 4.5 percentage points.

Johnson said he doesn’t think the critical advertising would erode support for his campaign, pledging he wouldn’t run negative ads in the race’s final days and instead would keep talking about the issues.

“I’m far more interested in talking about my strengths rather than anybody else’s weaknesses,” he said.

Krebs’ campaign didn’t immediately comment on the poll. Tapio, who headed President Donald Trump’s South Dakota campaign, said in an email that the poll is days old and contains many undecided respondents.

“My goal was to give the voters of South Dakota a viable option between two Establishment career politicians and a political outsider who has the courage to face tough issues head on, just like President Trump,” Tapio said.

The candidates were set to debate Wednesday evening on KELO. The Republican primary winner is set to face Democrat Tim Bjorkman, a former judge, and Libertarian George Hendrickson and independent Ronald Wieczorek in November.