The claim from former ranger Kim Peach that Sheehy in fact shot himself on a family trip in Montana was immediately dismissed by Sheehy and his allies as a smear campaign engineered by Democrats in a race that’s expected to help decide control of the Senate.

But with the election less than three weeks away, it adds to the huge pressures that the political newcomer already faced as he challenges three-term Democratic incumbent Sen. Jon Tester.

Sheehy is a former U.S. Navy SEAL and his military record is a centerpiece of his bid for office. During stump speeches and in a book published by Sheehy last year, he recounts being wounded on multiple occasions during combat, including in the arm in 2012.

Sheehy was awarded a Purple Heart for wounds sustained in a separate combat incident and was also awarded a Bronze Star.

A Sheehy campaign spokesperson said Peach was a partisan Democrat pushing a “defamatory story.”

“Anyone trying to take away from the fact that Tim Sheehy signed up for war as a young man and spent most of his 20s in some of the most dangerous places in the world is either a partisan hack, a journalist with an agenda, or outright a disgusting person,” spokesperson Katie Martin said.

He’s faced scrutiny over the arm wound since April, when The Washington Post quoted a Glacier National Park ranger anonymously saying Sheehy accidentally shot himself in 2015, when he was travelling with his family and his gun fell out of a vehicle and fired when it hit the ground in a parking lot on Logan Pass. The ranger who was quoted in the story was Peach.

Sheehy was cited by Peach and paid a $525 fine for illegally discharging a firearm in Glacier, government records show.

The Republican candidate said in response to the April story that he lied to the park ranger — not about being wounded in Afghanistan.

Sheehy said he fell while hiking at Glacier and injured his arm, then concocted the story about the bullet wound to cover up the fact that the 2012 incident may have been friendly fire. He said he didn’t want members of his SEAL unit in Afghanistan to suffer any consequences.

With absentee voting in Montana underway and Sheehy poised for potential victory, Peach, a Democrat, said Friday that he “couldn’t let him get way with something like that without the truth being told.”

Peach said he interviewed Sheehy at the hospital where he was treated for the bullet wound.

“At the time, he was obviously embarrassed about it. And you know, he admitted to what I was there for — the gun going off in the park,” Peach told The Associated Press. “He know the truth and the truth isn’t complicated. It’s when you start lying things get complicated.”

His decision to go public was reported earlier by the Post.

Peach worked as a park ranger for more than three decades and is now retired. He lives in small town near Glacier. He’s posted a photo of himself on social media wearing a “Make America Wrong Again” hat and said he votes for Democrats.

He denied any connection with the Tester campaign or other Democratic organizations.

Tester’s campaign has been running ads in recent weeks criticizing Sheehy for lying about the gunshot wound. A campaign spokesperson did not have an immediate comment Friday.

The Montana Democratic Party seized on Peach’s latest comments as providing a “firsthand account” of what happened to Sheehy.

But National Republican Senatorial Committee communications director Mike Berg rejected the latest reiteration of the accusations against Sheehy. He suggested it’s a sign of Democrats’ desperation because they fear Tester’s going to lose.

“It’s the last gasp of a career politician who sees his career about to end,” Berg said.