The imagery depicts a burning White House, cracked Washington Monument.
But it was this poster, sold at the venue last night that started generating debate Tuesday afternoon after it caught the attention of conservative media news outlets.
Hours later, Chris Meagher, a spokesman for Tester, said the campaign did not have input into the poster's design and did not approve of it.More news: Twitter Suspends Infowars’ Alex Jones for One Week for Violating Abuse Policy
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Pearl Jam bassist Jeff Ament's notes about the Missoula concert poster.
He wrote: 'This poster from Pearl Jam is disgusting and reprehensible.
Jon Tester (D-Mont.) supporters, images of the White House engulfed in flames and the remains of President Donald Trump being picked clean by an American bald eagle are on display.
The Republican National Committee this summer released a video, called "The Left in 2018: Unhinged", featuring comments from Madonna and an image of Kathy Griffin holding a fake Trump severed head.
Earlier this year, Ament - who referenced "Russian money, golf courses and hookers" in his description of the poster - admitted he was keen to use the Montana concert to boost the Democrat campaign. A spokesman said he didn't like the poster. "Maryland Matt. Stars n stripes as flames". In a statement accompanying the poster, Ament said, "We're at a tipping point and it's time to take action", calling Tester "the real deal". "And we don't condone violence of any kind".
The president has not yet commented on the Pearl Jam poster, which was created to promote a Rock2Vote concert aimed at encouraging young people to vote against the Republicans in the November midterm elections.